Using these ChiaoGoo Knit RED Circular Needles is a breeze. Just thread your yarn through the cable and start knitting as you normally would. When choosing a needle, pick the size and length that best suits your project. For larger projects, longer needles might be more convenient. As for care, keep the needles clean by wiping them gently with a soft cloth after each use. Avoid using harsh chemicals as they can damage the nylon coating. Store them in a dry place, and if possible, in a needle case to prevent bending or damage. Don't force the yarn too hard over the needles, as it could cause the nylon coating to wear out faster. With proper use and care, these needles will serve you well for many knitting projects.