Using these Addi Turbo circular needles is super easy. Just thread your yarn through the cord and start knitting as you normally would. The nickel coating helps the yarn move smoothly, so you can work faster. When it comes to care, simply wipe the needles with a dry cloth after use to keep them clean. As for the special sizing, make sure to double - check the actual size against the label to avoid any mistakes in your project. Also, be gentle with the plastic needle tips of the US 36 and US 50 needles to prevent any damage.