They have a knob on one end, which keeps the stitches from falling off the needle. The knob should be light enough to keep the needle balanced. Needle shafts come in a range of lengths from 7.5 to 14 inches. Choose a length that will accommodate all your stitches but not so long so that it feels unwieldy. The shorter length straight needles are easiest for beginners to use. The hot stamping in both US and Metric sizes gives it the unique look.