What you get: 75 Size M white prewound bobbins, 60S/2 low-stretch spun polyester (#90 / 50WT) on a plastic-sided shell, about 150 yards each - roughly 1.5x the yardage of a Size A bobbin in the same thread weight. Made by Doublelin, an embroidery machine manufacturer since 1989.
Size M is not the same as Size A or Size L. Size M (also Class M, Style M, or M-Class) measures 1-1/64 in (2.60 cm) diameter x 7/16 in (1.10 cm) height. Size A and Size L have different dimensions and are not interchangeable.
Two main uses. (1) Longarm and mid-arm quilting on Handi Quilter, Innova, Gammill, APQS, and Tin Lizzie - the larger Size M capacity means fewer mid-project bobbin changes on edge-to-edge and free-motion work. (2) Large-bobbin industrial embroidery on Tajima and Barudan commercial machines - 60S/2 is the standard embroidery bobbin thread weight. White suits cream, ivory, pastel, and light tops/fabrics.
Match the thread weight. If your machine manual specifies #90 or 50WT, this is the right weight. For matched-weight quilting (40WT bobbin with 40WT top thread), choose a Doublelin 40S/2 Size M instead. Low-stretch spun polyester gives a soft matte back on quilts and embroidery.
How to confirm fit: check your machine manual for Size M / Class M, view our compatibility photos, or measure a bobbin to 1-1/64 in diameter x 7/16 in height. Not for home sewing machines that take Size A (Class 15) or Size L bobbins.
FAQ
Q: Will these fit my Handi Quilter Avante or Sweet 16? Yes - all Handi Quilter machines use Size M / Class M bobbins.
Q: My manual says #90 - is this right? Yes. #90 is the Japanese Gunze count, equal to 60S/2, about 50WT in the US system.
Q: Are #90 and 90WT the same? No - #90 is about 50WT; 90WT is a different, finer thread.
Q: How much thread per bobbin? About 150 yards, roughly 1.5x a Size A bobbin in the same weight.
Q: Can I rewind them? Yes - the shell is designed for repeated rewinding.
All brand names referenced are for compatibility purposes only. No affiliation or endorsement is implied.
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