Superior Material: The open jump rings are made of iron with shiny gold or silver electroplating on the surface, which is durable, not easy to fade and lightweight for long-term use. Package Includes: It includes 690 pieces double ended jump rings with 6 sizes (4mm, 5mm, 6mm, 8mm, 10mm, 12mm) in silver or gold color, which is enough to meet your different craft needs. Simple to Use: These metal round jump rings have excellent spring retention. It is easy to open the ring and close it tightly. Don't worry about your keys or crafts falling apart. Convenient to Store: All split rings are packed in a divided plastic storage case, easy to find and carry. You can make DIY discovery projects at any time. Wide Application: These open loop rings are widely used for many DIY craft projects, decorating delicate bracelets, anklets, necklaces, etc. It is also perfect for key chains.