Dritz® Class 66 Plastic Top Drop-In Bobbins are round cases that store yarn and thread in a sewing, overlock, or embroidery machine. Compatible with brands like Singer, Baby Lock, Brother, Riccar, and Simplicity & White, Dritz® Class 66 Plastic Top Drop-In Bobbins can be used on top drop-in machines to give the right amount of tension for perfect stitching. These bobbins are sourced from plastic and are more affordable and have a lighter weight than metal ones. When considering Dritz® Class 66 Plastic Top Drop-In Bobbin, always check the machine’s manual or use an old bobbin to match it to a new one. Shop Dritz® Class 66 Plastic Top Drop-In Bobbins online at wholesale prices!