They have a nickel-plated, copper join. Sizes 3 (3.25 mm) and larger are crimped to guarantee no separation AND they swivel! Sizes 0 (2 mm) through 2.5 (3 mm) have the same memory-free cable as our RED circulars and TWIST cables!
Needle size is permanently laser imprinted on each circular. Bamboo circulars are available in the patina color only.
I am disappointed with these needles. The description says they "have the same memory-free cable as our RED circulars", but they do not. the cables are too stiff. I prefer a wooden or bamboo needle, so thought these would be perfect, but I will look into a different brand in the future.