SILENT MOVEMENT: This product is made of non-toxic, bite-resistant and abrasion-resistant materials, and the translucent materials are bright in color, which brings health to pets. The innovative ball bearing spins quietly. Make sure the silent hamster wheel rotator slides smoothly and quietly without squeaking or rubbing or noise from the bottom bracket. company against slippage due to inertia during running. The side tread on the inner wheel is slightly convex, which effectively increases friction and prevents slippage while running. edge is defined with rounded edges. More comfortable. The interface buckles on both sides of the runner are very sturdy. HEALTHY SPORTS: Hamsters and hedgehogs are suitable for 12-21cm wheels, 31cm wheels are suitable for most pets. They are alone when you are away, please buy a toy balance bike to help your pet relieve boredom, keep moving, keep stamina and health. This running wheel is specially designed for hamsters, gerbils, hedgehogs, mice and other similar small animals and is easier to clean. BETTER THAN LIKE: Compared to wooden running wheels, this product is lighter and more portable.Pets do less work and make them more comfortable. The wooden running wheel may sometimes have dangerous thorns, which can hurt your pet. Our products will not have this situation and can give your pet a safer running environment. SERVICE OF QUALITY: Your hamster can gnaw on the running wheel at night. Prepare a stick or a sweet branch for your hamster to grind its teeth to prevent it from gnawing on the running wheel. Of course, the running wheel is also safe for hamsters Made of material, if you have any questions about the purchase, you can contact us, we will solve your problems with high quality service.