Using these Addi Turbo circular needles is easy. Just thread your yarn through the cord and start knitting as you normally would. The smooth nickel coating helps the yarn slide easily, so you can work faster. When it comes to sizing, double - check the actual size as some smaller sizes don't follow the standard US sizing. As for maintenance, keep them clean by gently wiping them with a soft cloth. Avoid using harsh chemicals as they may damage the nickel coating. Store them in a dry place to prevent rusting. And be careful with the plastic needle tips of US 36 and US 50 to avoid breaking them.