Using these KnitPro Mindful Collection interchangeable lace needle tips is easy. First, choose the cable that suits your project, whether you prefer a swivel or non - swivel one. Then, simply screw the 5'' US 10 needle tips onto the cable. Remember, if you want to make a 16 or 20 needle, use the 4 tips. When it comes to maintenance, keep them clean and dry. You can gently wipe them with a soft cloth after use. Also, store them in a dry place to prevent rusting. Although all tips fit all cable sizes, make sure to double - check the connection for a secure fit before starting your knitting project.