Using these addi Turbo Circular Needles is a piece of cake. First, choose your desired yarn and start threading it onto the needle. The nickel coating helps the yarn move smoothly, so you can work quickly. When knitting, be aware of the non - standard sizing of some smaller needles as mentioned in the product description. As for maintenance, keep the needles clean and dry. You can use a soft cloth to wipe them after each use. Store them in a cool, dry place to prevent the nickel coating from getting damaged. And be gentle with the plastic needle tips of US 36 and US 50 to avoid cracking.