Using these KnitPro Mindful lace needle tips is easy. First, choose your preferred cable, whether it's swivel or non - swivel. Screw the 4'' US 10.5 tips onto the cable. Remember, if you want to make a 16 or 20 needle, use the 4 tips. When not in use, keep them in a dry place to prevent rusting. Clean them gently with a soft cloth. Don't use harsh chemicals as they can damage the stainless - steel material. Enjoy your knitting with these great quality needle tips!