PACKAGE CONTENT: 50 x key rings with chain + 50 x open jump rings. .DIMENSION: Key ring diameter: 25 mm /30mm, Open jump ring diameter: 8 mm/0.31inch. .MATERIAL: Made of nickel plated metal, not easy to fade and rust, strong and durable. With glossy surface and good texture, this key ring can match well with your keys. .EASY TO USE: The keychain rings are convenient to connect keys, clasps, charms, links and other ornaments. Easy to use and convenient to carry. .WIDE APPLICATION: Key rings can collect your door keys, garage keys, car keys, hang cards, DIY accessories (trinkets, beads, tiny dolls, toy models, mini cubes or tags), also can used for making arts and crafts project.