Description: Our sports running wheel toy does not jam and runs more safely which prevents hamsters from pinching their feet during exercise. It is stable and anti-rollover allowing small animals to play with confidence. Not only can the sport wheels toy help small animal to exercise consume part of their physical strength help them maintain a good body shape but also play a role in relieve stress and boredom. It is constructed of ABS material. This product diameter is 13cm. It is suitable for hamster guinea-pig hedgehog squirrel chipmunk golden bear rat and other small animals. Item Name: Hamster Toy Material: ABS Features: Bite Resistant Eco-friendly Double Bearings Extend Holes: 5.5-7cm Size Details: Diameter: 13cm/5.12 (Approx.) Notes: Due to the light and screen setting difference the item s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Hamster Toy