Using your ChiaoGoo End Stoppers is a breeze. When you want to switch needle sizes for a new project, just screw the appropriate stopper into the end of your ChiaoGoo Twist Red Cable. This will keep your current project safe and secure. Remember, white small [S] stoppers go on [S] coded cables, black large [L] stoppers on [L] coded cables, and red mini [M] stoppers on [M] cables. To keep them in good condition, store them in a dry place away from sharp objects that could damage them. With these stoppers, you can smoothly move between different knitting projects without any hassle.