21cm wheel offering comfortable exercise with a silent design. - Model Name: Silent Wheel 21 - Size: 21cm - Color: White - Material: Plastic Thank you for viewing. SANKO U44 Silent Wheel Flat 21 Body size (width x depth x height): 21 x 11 x 24cm Body weight: 0.615kg Material: PS, ABS, steel Target animals: Golden hamsters, chipmunks, degus, etc. Set contents: Main unit 1, fixing stand 1 Stable rotation and silent design! No contact with the back and the inside is flat! Wide depth and flat foot area! The Silent Wheel F (Flat) uses a large bearing for stable rotation, reducing friction noise during rotation. The rotating parts are concentrated on the back of the main unit, and the surface of the main unit is flat, so the back will not be touched during exercise. And, the wheel body can be attached and detached just by twisting the bearing cover, making it easy to clean! Raw materials/ingredients PS, ABS, steel