Pre-Wound 69 Nylon Bobbins 72/box
Fil-Tec's Magna-Glide, prewound bobbins are a high quality, 60wt polyester yarn. The patented magnetic core prevents backlash creating consistent stitches and eliminating the need for a backlash spring. (If your bobbin case has a backlash spring, remove spring before inserting this bobbin.) This trouble free bobbin reduces lint and residual build up in the bobbin case. Always insert bobbin magnet side down into the metal case. Each bobbin contains 210 yards of thread. Black and white come in 230 yards. Made in the USA.