The ChiaoGoo Patina 24" Circular Needles are made of Moso bamboo, a strong and durable variety. Circular needle sizes US 0-2.5 have a memory-free cable found on ChiaoGoo's RED circular and TWIST cables. Circular needle sizes US 3, and larger have a pliable nylon cable, the tips swivel freely, and the nickel-plated copper join is glued and crimped to ensure no separation. Needle sizes are laser imprinted on the needles for easy identification.