The 16" patina bamboo circulars have a smooth nickel-plated, copper join. Sizes 3 (3.25 mm) and larger are crimped to guarantee no separation and the clear nylon cables swivel. Sizes 0 (2 mm) through 2.5 (3 mm) have the same memory-free steel cable as the Red Lace circulars and do not swivel. Final sale