Specifications: Exercise wheel for small pet such as hamster, gerbil and rat. Adopt strong steel shaft and premium grade PP material. No gaping place, your pet wont get its feet hurt or wrenched. Non-slip convex lines enlarge friction and enhance stability to avoid false step. Silent structure, your animal can run at night without disturbing others. A funny toy help to keep your pet slim and healthy. Item Name: Hamster Wheel Material: Plastic + Metal Features: Exercise Toy, Non-slip, Silent, with Holder Round Disc: Diameter: 21cm/8.27", Width: 8.5cm/3.35" (Approx.) Holder: Height: 16cm/6.3" (Approx.) Total Height: 23cm/9.06" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Hamster Wheel 1 x Holder