PH PandaHall 1 Box 6 Sizes Antique Bronze Split Iron Double Jump Rings for Jewelry Making, Nickel Free (Diameter: 4mm, 5mm, 6mm, 7mm, 8mm, 10mm) Size: 4mm/5mm/6mm/7mm/8mm/10mm, 1~1.3mm thick. Metal Color: Antique Bronze; Material:Iron; Shape:Ring; Finish: Nickel Free Use for the female half of clasps, hooks and other fasteners. Wide Application: Great for DIY your special & unique jewelry, excellent size for suspending small items from delicate necklaces, bracelets, anklets.