Crystalites Acrylic Knitting Needles. 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. These 10in knitting needle pairs are available in US sizes 8 to 15 (5mm to 10mm): each sold separately. They are fun and work great too! Great for Kids!