Features Material: Plastic and steel bearing. Color: Gray. Size: 18. 00* 18. 00* 11. 50cm/ 7. 07* 7. 07* 4. 52inch. - slip thread design: This hamster silent running wheel adopts - slip thread design, which can protect pets from rolling due to inertia while playing, creating a exercise environment. Main: This hamster mute running wheel can provide a playing and exercise environment for your pet. Very hamsters jogging or running exercise to promote the healthy growth of pets. Comply with aerodynamics: This hamster silent running wheel is aerodynamic, which can reduce wind resistance, rotate smoothly, and has little vibration. Low noise: This hamster silent running wheel is made of high- quality plastic, with fine workmanship and low noise when rotating, which can relieve the boredom of pets and will not cause a lot of noise. Easy to use: This hamster silent running wheel is and easy to use. a very good pet exercise jogging wheel. Package Including 1* Hamster Exercise Wheel