Living World Exercise Wheel is going to be your Hamsters favorite new boredom buster. The comfortable and solid surface will ensure that your small pet gets all the stimulating exercise he needs while preventing injuries from happening. The versatile design was made to adapt to any kind of cage: it comes with a solid stand and suction cup that adheres firmly to non wire habitats, and there is also a locking mechanism that can be securely attached to wire cages. The silent design will allow your Hamster to have fun at anytime of the day without bothering anybody. Diameter : 14 cm (5.5in) For Hamsters