Using these addi Turbo Circular Needles is easy. First, choose the right size for your project. If you're a beginner, start with a larger size. Thread your yarn through the needle and start knitting as you normally would. The nickel coating helps the yarn move smoothly, so you don't have to tug too hard. As for the size differences, always double - check the actual size of the needle according to the note on the product. When it comes to maintenance, keep the needles clean and dry. Avoid bending the cords too much to prevent damage. If you're not using them for a long time, store them in a cool, dry place. Also, be careful with the plastic needle tips of US 36 and US 50, as they can break if handled roughly.