ChiaoGoo fixed Bamboo Circulars are made of Moso bamboo which is the largest and strongest bamboo out of over 1,000 species.
Sizes US 0 (2mm) through US 2.5 (3mm) have memory-free cable and sizes US 3 (3.25) and larger have a nickel-plated, copper join that is glued and crimped to guarantee no separation. The joins are fantastic, the nylon cable is pliable and the tips swivel freely.
Sizes US17 (12.75mm) through US 50 (25mm) are made of wood.
Needle size is permanently laser imprinted on each circular.
Product image shown covers a range of needle sizes.