Using these addi Turbo Circular Needles is easy. Just thread your yarn onto the needle and start knitting as you normally would. The smooth nickel coating helps the yarn move along the needle without getting stuck. When it comes to maintenance, simply wipe the needles with a dry cloth after use to keep them clean. Avoid using harsh chemicals as they may damage the coating. As for the non - standard sizing, make sure to double - check the actual size of the needle you're using to ensure your knitting turns out as expected. Also, handle the plastic tips of the US 36 and US 50 needles gently to prevent breakage.