The Living World Exercise Wheel is an excellent way to get your hamster some much needed exercise. The wheel features a comfortable and solid surface that will prevent injuries from happening. The versatile design can be used in any cage, and the wheel comes with a solid stand and suction cup that adhere firmly to non wire habitats. The silent design allows you to enjoy your time without bothering anyone. The wheel measures 5.5 inches in diameter and is perfect for any breed of hamster.