Using your addi Turbo Circular Needles is easy. Start by threading your yarn through the needle tip and begin your knitting as you normally would. The smooth nickel coating helps the yarn move freely, so you can work on your project without interruptions. When it comes to maintenance, keep the needles clean by wiping them with a soft, dry cloth after each use. Avoid using harsh chemicals as they may damage the coating. Regarding the non - standard sizing, always double - check the actual size against the label before starting a project. And since the US 36 and US 50 tips are plastic, handle them gently to prevent breakage.