Circular bamboo knitting needles are smooth and warm, as well as very durable. Bamboo needles are often preferred for very slippery fibers and they feel great in your hand. ChiaoGoo Circular Bamboo Knitting Needles feature a finer tip and flexible rotating joint, providing comfort and ease of use, and preventing damage to the cable. The joint is smooth and won't snag fine yarns. Our 40″ (100 cm) patina, bamboo circulars have sleek nickel-plated, copper joins with pliable, clear, nylon cables. Sizes 3 (3.25 mm) and larger are crimped to guarantee no separation and they swivel! Needle size is permanently laser imprinted on each circular for easy reference.