Using these addi Turbo circular needles is easy. Just thread your yarn through the cord and start knitting. The smooth nickel coating allows the yarn to move freely, so you can work on your projects quickly. When using, be aware of the non - standard sizing of some smaller needles as mentioned. For maintenance, keep them in a dry place. You can use a soft cloth to wipe them clean if they get dirty. Avoid dropping them on hard surfaces to prevent damage to the plastic tips (for US 36 and US 50). Happy knitting!