Using these ChiaoGoo Knit RED Circular Needles is a breeze. Just thread your yarn onto the needle and start knitting as you normally would. When using, make sure the yarn is smoothly placed on the cable to avoid tangling. As for maintenance, keep them in a dry place to prevent rusting. After each use, gently wipe the needles and cable with a soft cloth to keep them clean. Also, store them properly to avoid bending or damaging the tips. With these simple steps, your needles will last a long time and help you create amazing knitting projects.