Using your Addi Turbo Circular Needles is super easy. Just thread your yarn through the needle and start knitting as you normally would. The nickel coating helps the yarn glide smoothly, so you can work faster. When it comes to maintenance, gently wipe the needles with a soft cloth after each use to keep them clean. Avoid using harsh chemicals as they may damage the coating. Be aware of the non - standard sizing for some of the smaller needles, as mentioned in the product description. Also, since the US 36 and US 50 needle tips are plastic, handle them with a bit of care to prevent breakage.