La Pierre Magic Bobbin Washers Pack of 12 M Class Bobbins

Special size for Long-Arm Machines or M style Bobbin Cases.

Easy to use! Just drop a Mega Genie Magic Bobbin Washer into your bobbin case, replace the bobbin, and you're good to go! Eliminates the backlash and "birds' nests" on the underside of the quilt when changing directions at high speed.

Pack of 12 for M Class Bobbins