Outline design: Intimate mute design, which means the hamster will not disturb your rest and sleep during ; exercise while meeting the needs of the owner and ; pet. Sports and entertainment: It helps hamsters have fun and exercise, keep them happy and healthy. Application: Installed in a new living space with a new foot roll or can be connected to any wire cage. size: 15cm in diameter, 6.5cm wide, which is easy to move in hamsters and not easy to fall. Suitable for: Suitable for hamsters, guinea pigs, zearas and other small animals delivery quantity: 1 piece of