Using these Addi Turbo circular needles is a breeze. Just thread your yarn through the needle and start knitting as you normally would. The smooth nickel coating helps the yarn move easily, so you can work faster. When it comes to sizing, double - check the notes we've provided as some sizes don't follow the standard US measurements. As for maintenance, keep the needles clean and dry. You can use a soft cloth to wipe them down after use. Store them in a cool, dry place to prevent any damage to the cords or the needle tips. If you have any questions, don't hesitate to reach out!