Using addi Turbo Circular Needles is easy. Just thread your yarn through the needle and start knitting as you normally would. The nickel coating helps the yarn glide smoothly, so you can work faster. When using these needles, keep in mind the non - standard sizing for some of the smaller needles as mentioned in the product description. For maintenance, you can gently wipe the needles with a soft cloth after each use to keep them clean. Avoid using harsh chemicals or abrasive materials as they may damage the nickel coating. Store the needles in a dry place, preferably in a knitting case, to prevent them from getting bent or damaged. And don't worry about the plastic needle tips of US 36 and US 50; they are durable but handle them with care to avoid breakage.