These stylish wristlets double as a keychain as well. You can detach them and interchange them with other kechain wristlets and catch them all like pokémon. They all come with a keychain ring. Just in case you do not have one or if the one you have is currently worn out. The key rings are 25mm, and the swivel hook is 1in. Enjoy never losing your keys around or not being able to find them in your purse/backpack or around the house. The wrislet keychain is very noticeable with its pop of bright colors and intricate patterns.