Package Includes:1 x Hamster Running Disc Toy Materials: Plastic Quantity:1pc Dia:12/14/17.5/21cm Color:Pink Blue Features: 1. Exercise wheel for small pet such as hamster gerbil etc. 2. Anti-slip strip protecting your little guy from sliping over due to inertia. 3. Made of premium quality plastic material which is environmentally friendly and wear-resistant. 4. Easy and convenient to install quickly have fun. 5. Silent structure your animal can run at night without disturbing others.