5.9x1.75mm Gunmetal Plated Mini Paperclip Cable Chain. This rectangular cable chain is made from a hypoallergenic brass core and electroplated 100% nickel-free. Each link measures 5.9 x 1.75mm and is made with 23 gauge wire. This chain meets all lead-safe requirements. We love using this chain for simple necklaces. Sold by the foot (12 inches). Chain lengths of under three feet cannot be returned.