Using these ChiaoGoo Knit RED Circular Needles is a breeze. Start by threading your yarn onto the needle. The smooth red nylon - coated cable allows the yarn to slide easily, so you can knit without any hitches. When working on a project, choose the appropriate size and length based on what you're making. For larger projects, longer needles might be better, while smaller ones are great for detailed work. As for maintenance, after you're done knitting, gently wipe the needles with a soft, dry cloth to keep them clean. Avoid using harsh chemicals or abrasive materials as they could damage the smooth finish. Also, store the needles in a dry place to prevent rusting. If you notice any issues with the cable or the tips, stop using the needles and check for any signs of damage.