100% SATISFACTION GUARANTEE - In case anything goes wrong, we will respond to your concerns within 24 hours. Order now! It's recommended for most Syrian Hamsters, Sugar Gliders, Degus, Rats, and Hedgehogs. We designed 2 sizes with different Dia. To provide a back-friendly running experience to hamsters of various species and sizes, please notice the right one for your pets/cages/glass tank. Adjustable Height & Stable Experience-Adopt a 30mm Back Acrylic pillar as the main support for maximum protection against rebound and deflection during exercise. Variable height is between 10.6" (ca. 27cm) to 15"(ca. 38cm) bottom height, You can adjust the height of the hamster wheel's running drum to fit the species of pets you care for or the size of the cage you used. Safety & Easy to Use - The entire body are integrated, also the running track is continuous without cracks or tripping problems, reducing the risk of fur/tail entanglement, pet wrap-a-round and other injuries. The running drum is easy to disassemble and water washable for cleaning easily. Free Hassle & Running: Designed with the 12-degree M-shaped gentle slope and enlarged runway makes your gerbil feel as if it is running on a gentle dune runway. Effectively reduces the risk of being thrown off, and can buffer and slow down easily. BUCATSTATE Starlight Quiet Spinner Mouse Wheel 2.0: Designed with Al alloy dual ball bearings and high precision axis to ensure the wheel glides smoothly and silently. The bearings SPIN around the bolt as your pet runs reducing friction and noise during running. Allows your animals to run comfortably and happily without noise at night. (Ball bearing can not be soaked into the water directly).