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