Using these Addi Turbo circular needles is a breeze. Just thread your yarn through the cord and start knitting. When you're done, gently remove the yarn from the needles. As for maintenance, keep them in a dry place to prevent the nickel coating from getting damaged. Remember, some of the smaller sizes have non - standard US sizing, so double - check the actual size before starting your project. Also, be careful with the plastic tips of the US 36 and US 50 needles as they can break if mishandled.