Steady Stitch® Style L Magnetic Paper Sides Polyester Prewound Bobbins

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The Steady Stitch® Magnetic Core Style L Bobbin is a specialty bobbin for machines that require magnetic-core bobbins for proper tension control. Some commercial embroidery machines use a magnetic bobbin case that interacts with a metal-core bobbin to maintain consistent tension during stitching — using a non-magnetic bobbin in these machines causes tension problems, thread breaks, and poor stitch quality. Same precision-wound polyester thread and Style L paper-sides design as our standard bobbins, with the addition of a magnetic core. Check your machine’s manual to confirm if you need magnetic-core bobbins — if you do, you really do, and standard bobbins won’t work correctly.

Style L Magnetic
Bobbin size — confirm your machine’s required style before ordering.
Paper Sides + Magnetic Core
Flange design — affects durability, handling, and per-piece cost.
White
Color option — single option.
Best For
Specific machines that require magnetic-core bobbins for proper tension control
⚠️ This product is Style L Magnetic. Confirm your machine’s required bobbin size before ordering — Style L and Style M are not interchangeable. See all bobbin options →
🚚 Same-day shipping before 3:30 PM CT  |  🎁 Free shipping over $200  |  ✨ Precision prewound polyester bobbins

$34.64

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Description

MAGNETIC CORE — TENSION CONTROL

Steady Stitch® Magnetic Core Style L Bobbins

Magnetic-core Style L bobbins — for machines that require magnetic tension control.

🎯 Style L Magnetic
🪡 Paper Sides + Magnetic Core
🎨 White
✨ Precision Prewound
🏷️ Code: SSL-MAG

What Is a Bobbin — And Why Does Quality Matter?

A bobbin is the small spool that holds the bottom thread in your embroidery machine. As the top thread (your Exquisite 1000m polyester or whatever color you’re stitching) passes through the fabric, it interlocks with the bobbin thread on the back side of the design — creating the lockstitch that makes the embroidery hold together. The bobbin thread shows on the back of every embroidered garment.

Why prewound bobbin quality matters:

  • Tension consistency — Cheap bobbins or hand-wound bobbins have uneven tension that causes stitch quality problems
  • Production speed — Prewound saves 5-10 minutes per bobbin compared to winding your own from a thread cone
  • Stitch quality — Quality polyester bobbin thread holds tension at machine speed without breaking
  • Machine fit — Style L vs Style M sizing matters — using the wrong size causes feed problems and damaged bobbin cases
  • Color matching — White bobbin thread for most jobs, black bobbin thread for dark garments to prevent show-through
⚠️ Style L vs Style M — Make Sure You’re Buying the Right Size

This product is Style L. Bobbin size is not interchangeable — using the wrong size in your machine causes feed problems, damaged bobbin cases, and ruined embroidery.

Style L — The most common commercial embroidery bobbin size. Fits Tajima, Brother, Barudan, Melco, Ricoma, SWF, Happy, Baby Lock, and most multi-needle commercial machines.

Style M — Smaller bobbin used in specific commercial machines. Check your machine’s manual to confirm if you need Style M, not Style L.

✨ Precision Prewound

Each bobbin is precision-wound under consistent tension — eliminating the variability that hand-winding introduces. Consistent tension means consistent stitch quality across every garment.

🧵 Quality Polyester Thread

Wound with quality polyester bobbin thread that holds tension at high stitching speeds without breaking. Stronger and more consistent than cotton or rayon bobbin thread.

⚡ Save Production Time

Eliminate the 5-10 minutes per bobbin you’d spend winding from a cone. For high-volume shops, prewound bobbins save hours per week in operator time.

🏭 Commercial Machine Ready

Engineered for commercial embroidery machine bobbin cases. Consistent dimensions for clean feeding through high-speed production runs.

Why Choose These Style L Magnetic Paper Sides + Magnetic Core Bobbins?

The Steady Stitch® Magnetic Core Style L Bobbin is a specialty bobbin for machines that require magnetic-core bobbins for proper tension control. Some commercial embroidery machines use a magnetic bobbin case that interacts with a metal-core bobbin to maintain consistent tension during stitching — using a non-magnetic bobbin in these machines causes tension problems, thread breaks, and poor stitch quality. Same precision-wound polyester thread and Style L paper-sides design as our standard bobbins, with the addition of a magnetic core. Check your machine’s manual to confirm if you need magnetic-core bobbins — if you do, you really do, and standard bobbins won’t work correctly.

Best for these jobs:

  • Machines requiring magnetic-core bobbins (check your manual)
  • Specialty embroidery machines with magnetic bobbin cases
  • Production shops experiencing tension issues with standard bobbins
  • High-end commercial machines with magnetic tension systems
  • Replacement bobbins for machines that came with magnetic cores
  • Achieving consistent tension on machines designed for magnetic bobbins

Available Options

Choose your option at checkout.

Option
144 per Box

How to Install Prewound Bobbins

1️⃣ Load the Bobbin Case
Place the bobbin into your machine’s bobbin case with the thread feeding in the direction your manual specifies. Prewound bobbins drop in without any winding step.
2️⃣ Thread the Tension Spring
Pull the bobbin thread through the tension slot or spring on the bobbin case according to your machine’s threading diagram. Proper tension setting is critical.
3️⃣ Insert Into Machine
Insert the threaded bobbin case into the machine’s rotary hook or shuttle race. Listen for the click that confirms proper seating.
4️⃣ Test Stitch Quality
Run a test stitch on scrap fabric before starting production. Check that top and bobbin tension are balanced — the lockstitch should sit cleanly in the fabric, not pulled to either side.

Compare All 6 Bobbin Options

Different bobbin styles and flange types serve different needs. Use this table to find the bobbin that matches your machine and production volume:

ProductStyleFlangeColorsBest For
Steady Stitch® Paper Sides Style L BobbinsStyle LPaper SidesWhite / BlackThe everyday production standard — Style L paper-sided bobbins for most commercial embroidery machines
Steady Stitch® Plastic Sides Style L BobbinsStyle LPlastic SidesWhite / BlackProduction shops wanting more durable bobbins than standard paper sides — won’t tear or crush
Steady Stitch® Magnetic Core Style L Bobbins ← you are hereStyle L MagneticPaper Sides + Magnetic CoreWhiteSpecific machines that require magnetic-core bobbins for proper tension control
Steady Stitch® Sideless Style L BobbinsStyle L SidelessNo Flanges (Sideless)WhiteCost-effective production bobbins where bobbin case is already used — same quality, lower price
Steady Stitch® Style M Bobbins — 24 per TubeStyle MPaper SidesWhiteStyle M machines — small pack for trial, low-volume shops, or specialty machine use
Steady Stitch® Style M Bobbins — Bulk BoxStyle MPaper SidesWhiteHigh-volume Style M machine shops — best per-bobbin cost in our Style M lineup
💡 Quick decision guide: Most commercial embroidery machines use Style L. For everyday production, start with Paper Sides Style L. Upgrade to Plastic Sides Style L for more durability. Use Sideless Style L for value-priced production. If your machine requires magnetic-core bobbins, get Magnetic Core Style L. If your machine uses Style M, choose 24-tube for trial or 144-box for volume.

Machine Compatibility

Style L bobbins fit virtually every commercial multi-needle embroidery machine. We carry products for many of the top brands in the embroidery industry:

Tajima
Industrial & commercial
Brother
PR & commercial
Baby Lock
Multi-needle & single
Melco
Multi-head commercial
Barudan
BEKS & BEKY
Ricoma
EM & MT series
SWF
Korean commercial
Happy
HCH & HCS
Janome MB
MB-4 & MB-7
Toyota
Commercial systems

Always confirm your machine’s required bobbin size (Style L or Style M) before ordering. If unsure, call us at (512) 454-0505 and we’ll help you confirm.

Complete Your Embroidery Setup

Bobbins are one piece of a complete embroidery setup. Stock the rest from one vendor:

🪡 Embroidery Needles
DBxK5 Triumph chrome needles — sharp for woven, SES ball point for knits.

Shop Needles →

🧵 Exquisite 1000m Thread
100+ colors of 40 wt polyester embroidery thread on convenient 1000m spools.

Shop 1000m →

🧵 Exquisite 5000m Cones
Commercial 5000m cones for high-volume embroidery — fewer changeovers per shift.

Shop 5000m →

✨ KingStar Metallic Thread
15 vibrant metallic colors for high-impact decorative embroidery accents.

Shop Metallic →

✂️ Cutaway Backing
For stretch fabrics, knits, and high-density designs that need permanent support.

Shop Cutaway →

📐 Tear-Away Backing
For stable woven fabrics — twill, denim, canvas — temporary stabilizer that tears cleanly.

Shop Tear-Away →

🧢 Cap Backing
Tear-away stabilizer engineered specifically for finished cap embroidery — 3.0 & 3.5 oz.

Shop Cap Backing →

💨 Spray Adhesives
Temporary spray adhesive to hold backing in place while hooping tricky garments.

Shop Aerosols →

👕 Blank Apparel
Wholesale blank apparel — tees, polos, caps, jackets — ready for embroidery decoration.

Shop Apparel →

Why Order from River City Supply?

🚚
Same-Day Shipping
Orders before 3:30 PM CT ship same-day from San Antonio, TX.
🧵
One Vendor for the Whole Shop
Bobbins, thread, needles, backing — one supplier for your complete embroidery setup.
📞
Real Embroidery Help
Not sure if your machine takes Style L or Style M? Call us — we work with embroidery shops daily.
⭐
17+ Years in Business
Founded 2008 — serving screen printers & embroiderers nationwide.

Technical Specifications

Steady Stitch® Magnetic Core Style L Bobbins — Technical Specifications

SpecificationDetail
Product NameSteady Stitch® Magnetic Core Style L Bobbins
Product CodeSSL-MAG
BrandSteady Stitch®
Bobbin StyleStyle L Magnetic
Flange TypePaper Sides + Magnetic Core
Color OptionsWhite
Pack Size144 per Box
Thread MaterialPolyester bobbin thread
ConstructionPrecision-wound under consistent tension
Machine CompatibilityStyle L: Tajima, Brother, Barudan, Melco, Ricoma, SWF, Happy, Baby Lock, Janome MB, and most commercial multi-needle systems. Style M: specific commercial machines — check machine manual.
Recommended Top Thread40 wt polyester or rayon embroidery thread
UseDirect replacement for hand-wound bobbins in commercial embroidery machines
Color Matching TipUse WHITE bobbin for most embroidery, BLACK bobbin for dark garments to prevent show-through
StorageStore in original packaging, cool dry location, away from humidity
Country of OriginImported

Properties are typical values. Confirm critical specifications with our team for demanding applications.

Technical Sheets / Safety Data Sheets / Documents

Documents & Specifications

Need a spec sheet or machine compatibility chart for the Steady Stitch® Magnetic Core Style L Bobbins? Request the current documentation and we’ll send the latest revision for your records.

📄
Product Code SSL-MAG — Spec Sheet
Technical data, machine compatibility chart, and handling guidance
ℹ️ Build a Complete Embroidery Setup
Questions about specs or bulk pricing?

FREQUENTLY ASKED QUESTIONS

Frequently Asked Questions

What is a bobbin and what does it do?

A bobbin is the small spool that holds the bottom thread in your embroidery machine. As the top thread (your Exquisite embroidery thread or whichever color you’re using) passes through the fabric, it interlocks with the bobbin thread on the back side of the design — creating the lockstitch that holds the embroidery together. The bobbin thread shows on the back of every embroidered piece, which is why most shops use white bobbins for most work and black bobbins for dark garments to prevent show-through.

What’s the difference between Style L and Style M bobbins?

Size and machine compatibility. Style L is the most common commercial embroidery bobbin size — fits Tajima, Brother, Barudan, Melco, Ricoma, SWF, Happy, Baby Lock, and most multi-needle commercial machines. Style M is a smaller bobbin used in specific commercial machines (less common). The two sizes are NOT interchangeable — using Style M in a Style L machine (or vice versa) causes feed problems, damaged bobbin cases, and ruined embroidery. Check your machine’s manual to confirm which size you need. If unsure, call us at (512) 454-0505.

How do I know if I need magnetic-core bobbins?

Check your machine’s manual or contact your machine’s manufacturer. If your embroidery machine uses a magnetic bobbin case, you need magnetic-core bobbins — using non-magnetic bobbins causes inconsistent tension, thread breaks, and poor stitch quality. Magnetic bobbin cases interact with a metal core inside the bobbin to maintain consistent tension at speed. If your machine doesn’t require magnetic bobbins, use our standard Paper Sides Style L instead — magnetic bobbins are slightly more expensive and provide no benefit in machines that don’t require them.

Should I use white or black bobbin thread?

White for most embroidery, black for dark garments. The bobbin thread shows on the back of every embroidered piece — and depending on tension, can sometimes peek through on the front, especially on stretched or thin fabric. White bobbin thread is invisible behind most embroidery on light-to-medium garments. Black bobbin thread is essential for embroidery on dark garments (black t-shirts, dark uniforms, navy jackets) where white bobbin thread can show through as a visible white line behind the design.

Will these bobbins fit my embroidery machine?

If your machine uses the standard commercial Style L bobbin (Tajima, Brother, Barudan, Melco, Ricoma, SWF, Happy, Baby Lock, Janome MB, Toyota, and most other multi-needle commercial systems), yes — our Style L bobbins fit. If your machine uses Style M (some specialty commercial machines), make sure to buy our Style M version instead. Confirm your machine’s required bobbin size in the machine manual before ordering.

How many bobbins do I need to keep on hand?

Rule of thumb: stock enough bobbins to keep production running between order cycles plus a reasonable safety buffer. Most production shops use 24-36 bobbins per machine per week at typical volume. For a single-machine shop running 5 days a week, a 144-count box typically lasts 4-6 weeks. Multi-machine shops scale accordingly. Buying in 144-count quantities also delivers better per-bobbin pricing than smaller packs.

What thread weight should I use on the bobbin?

Our Steady Stitch bobbins are wound with quality polyester bobbin thread engineered specifically for commercial embroidery machines. The polyester construction holds tension at high stitching speeds without breaking. We don’t recommend trying to wind cotton or rayon thread for bobbin use — neither holds tension as well as polyester, and both are more prone to breaks at production speed.

How do I install a prewound bobbin?

Prewound bobbins drop directly into your machine’s bobbin case the same way self-wound bobbins do — there’s no special installation. Place the bobbin in the case with thread feeding in the direction your machine manual specifies, thread it through the tension spring, and insert the bobbin case into the machine. Always run a test stitch on scrap fabric to confirm tension is balanced before starting production.

How should I store unused bobbins?

Store bobbins in their original box or tube, in a cool dry location away from humidity and direct sunlight. Bobbin thread is durable and has no real shelf-life concern under normal shop conditions — bobbins purchased a year ago will work the same as fresh stock. For paper-sided bobbins, avoid stacking heavy items on top of stored boxes (paper flanges can crush). Plastic-sided bobbins are more forgiving in storage.
Not sure which bobbin you need?

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