Upper Material: The open jump rings are made of iron with shiny gold or silver electroplated on the surface, which is durable, not easy to fade and lightweight for long term use. .Package Includes: It includes 690 double lock 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 Use: These round metal rings have excellent spring retention. It is easy to open the ring and close it hermetically. Don"t worry about your keys or crafts falling apart. .Wide Application: These open loop rings are widely used for many DIY craft projects, for decorating delicate bracelets, anklets, necklaces, etc. It is also perfect for keychains. .Our products are made with the highest quality materials and are designed to provide you with the best possible user experience. We strive to ship out all orders within three days of purchase, and the estimated delivery time is 8-15 days.When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specificationsWe want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don''''t hesitate to contact us. We are here to help and will do our best to assist you.Thank you for choosing our product. We hope you enjoy it