You can attach these end stoppers by ChiaoGoo to the cable ends when you want to use the needle tips for other knitting projects. These stoppers prevent your stitches from falling off the cable. These rectangular end stoppers are made from resin. The white end stoppers fit the [S] cables, the black end stoppers fit the [L] cable, while the red ones fit the MINI TWIST cables. Supplied per 3 sets x 2 end stoppers.