Feature: 1. PP environmentally friendly resin material, non‑toxic and tasteless, environmentally friendly materials, small pets and owners are at ease. 2. The thickened running disc is safe, stable, and the thickened design of the wheel wall can effectively balancing the rotation speed. 3. Quiet, no noise during acceleration, high‑quality and durable bearings, greatly reducing noise, and high operating accuracy. 4. Anti‑slip lines, smoothly bulge, prevent pets from falling down due to inertia, thickened PP hard plastic wheel, prolong the service life. 5. To prevent gnawing, the outer edge is rounded and polished to make it more sturdy. Specification: Item Type: Hamster Wheels Material: PP Resin Color: White Purpose: Hamster and small pet running wheel Package List: 1 x Hamster Wheels 1 x Fixed Axle 1 x Nut