Made of high quality material beautiful and exquisite. Product diameter: 5.1 inches. 1 hamster wheel silent. ( Holder not included ) Super mute hamsters play at night does not affect the owner s sleep. Detachable design makes assembly easy safe wheel for pet s toes and tails. For SMALL hamsters mice gerbils or other small animals Encourage healthy exercise Please confirm whether the product size is suitable for your pet before buying