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. Sport wheels toy can help small animal to exercise, consume part of their physical strength, not only play a role in decompression and boredom, but also help them maintain a good body shape. Made of high-quality plastic material, the hamster toy is eco-friendly, durable to use and ensures the health and safety of pets. There are four different sizes for you to choose: 12cm, 14cm, 17.5cm, and 21cm. Available for hamster, guinea-pig, hedgehog, squirrel, chipmunk, golden bear rat and other small animals. Item Name: Hamster Toy Material: Plastic Features: Bite Resistant, Eco-friendly, Easy Installation Size Details: Diameter: 12cm/4.72" (Approx.) 14cm/5.51" (Approx.) 17.5cm/6.89" (Approx.) 21cm/8.27" (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