Using these addi Turbo circular needles is a piece of cake. Just thread your yarn through the needle and start knitting as you normally would. The smooth nickel coating helps the yarn move easily, so you can work faster. When it comes to care, simply wipe the needles with a dry cloth after use to keep them clean. Avoid using harsh chemicals as they might damage the coating. As for the sizing, double - check the actual size as some of the smaller ones don't follow the standard US sizing. And be gentle with the plastic needle tips on the US 36 and US 50 needles to prevent any breakage.