Using these Jimmy's SmartStix Double Pointed Needles is a breeze. Just start knitting your project as you normally would. When you need to measure your work, use the color-coded intervals on the needles. You can check your gauge or measure the length of your knitting right on the spot. As for maintenance, keep them in a dry place to avoid rust. You can gently wipe them with a soft cloth if they get dirty. Be careful not to bend the needles as that might affect your knitting. And always store them safely to prevent any damage.