Using your Addi Turbo Circular Needles is a piece of cake. Just thread your yarn through the cord and start knitting as you normally would. The smooth nickel coating helps the yarn glide easily, so you can work on your projects faster. When it comes to care, gently wipe the needles with a soft cloth after each use to keep them clean. Avoid using harsh chemicals as they might damage the nickel coating. As for the non - standard sizing, always double - check the actual size of the needle you're using to ensure your knitting turns out just right. And since the US 36 and US 50 needle tips are plastic, handle them with a bit of extra care to prevent breakage.