Using these Jimmy's SmartStix Interchangeable Needles is a breeze. First, pick the right needle tip size (from US 2.5 - 11) for your project. Pair it with the appropriate Jimmy's Smart Cord. Start knitting as you normally would. When you need to measure your work, just use the markings on the needle tips at 1 - inch intervals. You can also measure gauge easily. As for maintenance, keep them in a dry place. If they get dirty, you can wipe them gently with a soft, dry cloth. Avoid dropping them hard as it might damage the lightweight aluminum. Enjoy your knitting with these amazing all - in - one needles!