Our 16" bamboo circulars have a a fantastic join along with a clear nylon cable. The join is nickel-plated copper. Sizes 3 (3.25mm) and larger are crimped so there is no seperation and they SWIVEL! sizes 0 (2mm) thru 2.5 (3mm) have the save memory free cable as the red circulare but are coated in clear. Needle size is imprinted on the needles.