Using your addi Turbo Circular Needles is super easy. Just thread your yarn onto the needle and start knitting as you normally would. The nickel coating helps the yarn move smoothly, so you can work quickly and efficiently. When it comes to sizing, double - check the actual size as mentioned in the product description to make sure you're using the right needle for your project. As for maintenance, keep your needles clean and dry. Avoid bending the cords too sharply as this might damage them. If you're not using the needles, store them in a safe place to prevent the tips from getting damaged. Have fun knitting with your addi Turbo needles!