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 will help the yarn move freely, so you can work faster. When it comes to the non - standard sizing, make sure to double - check the actual size against your pattern requirements. As for maintenance, keep the needles clean by gently wiping them with a soft cloth. Avoid using harsh chemicals as they might damage the nickel coating. Store the needles in a dry place, and be careful not to bend the cords. With proper use and care, these needles will serve you well for many knitting projects.