Using addi Turbo Circular Needles is a breeze. Just thread your yarn through the cord and start knitting as you normally would. The nickel coating allows the yarn to move smoothly, so you can work on your projects faster. When it comes to sizing, double - check the actual size against the label as some don't follow standard US sizing. As for maintenance, keep your needles clean by gently wiping them with a soft cloth. Avoid using harsh chemicals as they might damage the coating. Store them in a dry place to prevent rust or damage to the plastic tips of the US 36 and US 50 needles.