Easy These slick spaceage washers eliminate the backlash in the bobbin when changing directions at high speed. Backlash creates "birds' nests" in freemotion quilting and embroidery. Just drop a LITTLE GENIE in the bobbin case, replace the bobbin and you're good to go Fits all domestic machines. Package of 12. Tough and longlasting.
For Home Sewing Machines with Snap-In Bobbins