Pandahall Silver Split Rings Iron Double Jump Rings 4mm 5mm 6mm 7mm 8mm 10mm Box Set for DIY Jewelry Making Findings 6 Sizes: 4mm/5mm/6mm/7mm/8mm/10mm, 1~1.3mm thick. Metal Color: Silver; Material:Iron; Shape:Ring; Excellent size for suspending small items from delicate necklaces, bracelets, anklets. Use for the female half of clasps, hooks and other fasteners. The product contains small parts, please put in out of reach of children to avoid accidents.