Crystalites Acrylic Knitting Needle Assortment. Susan Bates Crystalites are beautifully colored translucent plastic knitting needles. They are lightweight with a warm hand and a smooth finish for a light-as-air knitting experience. Each size is color coded so you can find the size you need at a glance. The knobs feature a no-roll design and the US and metric sizes are clearly printed on the knob. This gift set contains four pair of 10" needles in sizes 8 (5mm), 9 (5.5mm), 10 (6mm) and 10.5 (6.5mm).