These gold color key rings are make of metal, diameter is 1.2 inch/ 3cm, come with 25 pieces of key rings. The surface and edge of these key rings is smooth, It's easy to open the split on the ring to keep keys or other items organized. You can make your own key chain with your family and friends and enjoy the fun of DIY. Flat key rings are ideal for making key chains, jewelry supplies, purses supplies, lanyard supplies and other DIY projects.