Using these KnitPro Mindful Collection interchangeable lace needle tips is easy. First, choose the cable you like. You can pick a swivel or non - swivel cable based on your preference. Then, simply screw the 4'' tip onto the cable. Remember, if you want a 16'' or 20'' needle, make sure to use the 4'' tips. When it comes to maintenance, keep them clean and dry. Avoid using them with excessive force as it might damage the tips. Store them in a safe place, away from moisture and sharp objects. Enjoy your knitting with these great tools!