Using your Addi Turbo Circular Needles is a breeze. Just thread your yarn through the cord and start knitting as you normally would. The nickel coating helps the yarn glide easily, so you can work on your project more quickly. When using these needles, keep in mind the non - standard sizing of some smaller needles as mentioned. As for maintenance, simply wipe the needles with a soft cloth after use to keep them clean. Avoid using harsh chemicals on the nickel coating. Also, be gentle with the cords to prevent any snags or damage. If you're using the US 36 or US 50 needle tips, handle the plastic parts carefully to avoid breakage.