Size and Quantity:The diameters of jump rings are 4/5/6/8/10/12mm, Including 690 double loop jump rings, 6 different sizes, silver, the quantity meets your various craft or jewelry making needs. Material: These small key rings are made of iron, nickel plated on the surface, can prevent rust and oxidation. Good Spring Retention:These metal round key rings have great spring retention. It is convenient to open the ring, and spring back to close tightly. Now, you do not need to worry about your keys falling apart. Easy to Storage:All the round metal split rings are packed in a divided transparent box, which is easy to store and avoid losing. It is easy to carry and can be handmade at any time. Widely Application:The round flat split ring with easy-opening mouth which is good for connecting clasps, charms, links and other ornaments, perfect for keychain, DIY project, pendant, crafts, helping to show your idea to the public. Specifications: Material: Iron Color: as picture shown Quantity: 690 Pieces Features: Widely used to make DIY keychains, lanyards, pendants, jewelry and crafts. Fine craftsmanship, premium iron and nickel plating on the surface. Advanced cutting technology and easy opening mouth, practical and easy to use. Package included: 200 x 4mm Double loop rings 200 x 5mm Double loop rings 150 x 6mm Double loop rings 60 x 8mm Double loop rings 40 x 10mm Double loop rings 40 x 12mm Double loop rings 1 x Clear Box Note: Small parts, please keep away from child