1. Material safety: The hamster fitness ball is made of PC material; with lock design, simple installation, convenient and fast use, safe for pets to play2. Hollowed and breathable running ball: There are multiple ventilation holes on the running ball, which are safe and breathable, and small pets can play in it; the openings on both sides of the running wheel are designed to be more breathable, allowing hamsters to do aerobic exercise3. Transparent fashion ball: pets can play in the transparent big hamster ball, the owner can observe the pet's every move, cute and funny4. Easy to install: It adopts the lock buckle design, it can be formed by light pressing, and the installation is convenient; please install the clip according to the concave and convex5. DIY pet toys: This small hamster ball can be connected to a hamster tube, extending infinitely, allowing you to DIY combinations and increase the difficulty of pet movement