Using these Jimmy's SmartStix Double Pointed Needles is a breeze. Start by choosing the right needle size for your project, which in this case is US 10.5 (6.5mm). When you're knitting, use the color - coded intervals to measure your work as you go. To measure gauge, simply count the number of stitches and rows within an inch using the markings on the needles. For wraps per inch, wind your yarn around the needle and use the markings to get an accurate count. As for maintenance, keep them clean by wiping them with a dry cloth after each use. Avoid dropping them on hard surfaces as it might damage the aluminum. Store them in a safe place, like a knitting case, to prevent them from getting bent or lost.