Made of plastic material, it is safe and firm, resistant to bites and abrasion. The hamster exercise wheel has a diameter of 12cm, which is an ideal fitness toy for small pets. Silent rotating design, hamsters playing at night will not affect the owner's rest. The inner side of the running wheel is designed with a non-slip pattern, which effectively increases friction and prevents slipping while running. It is useful for small pets to exercise and play, and suitable for small hamsters, guinea pigs, gerbils, chinchillas, etc. Hamster Exercise Running Wheel 1 Piece Quiet Hamster Wheel Hamster Wheel Hamster Running Wheel Specifications: Material: Plastic Color: blue Size: 12cm Quantity: 1 piece The package includes: 1 * Hamster Exercise Running Wheel