These ChiaoGoo double pointed needles are great for knitting projects. To use them, simply start by casting on your stitches onto one needle. Then, transfer the stitches between the needles as you knit. When knitting, hold the needles gently but firmly to ensure smooth movement of the yarn. As for maintenance, you can wipe them clean with a soft cloth after use. Avoid using abrasive materials that could scratch the satin - sheen finish. Store them in a dry place to prevent rusting. Since they're made of stainless steel, they're quite durable, but be careful not to bend them forcefully.