Using Jimmy's SmartStix Interchangeable Needles is a breeze. First, pick the right needle tip size (US 2.5 - 11) for your project. Then, pair it with the appropriate Jimmy's Smart Cord. Start knitting as you normally would. When you need to measure your work, use the 1 - inch markings on the needle tips. To measure gauge or wraps per inch, simply count along the markings. As for maintenance, keep them in a dry place. You can gently wipe them with a soft cloth if they get dirty. Avoid dropping them or using excessive force as the lightweight aluminum can get damaged. Have fun knitting with your all - in - one tool!