Hamster Running Wheel Smooth Edge Bite Resistant Hamster Guinea Pig Exercise Toy Pet Supplies. Description: A pet running wheel is noiseless and stable when running. There are anti-slip lines to prevent slipping during running, which makes pets safer and more stable to use. A pet running wheel can help small animals exercise, consume part of their physical strength, and also play a role in reducing stress and relieving boredom. It is constructed of pp material. This product is available in sizes S, M, L, XL. It is suitable for small pet like hamster, squirrel, guinea pig, etc. Item Name: Hamster Wheel Material: PP Features: Silent, Gentle, Non-slip, Bite-resistant Size Details: S Diameter: 12cm/4.72" (Approx.) M Diameter: 14cm/5.51" (Approx.) L Diameter: 17.5cm/6.89" (Approx.) XL Diameter: 21.5cm/8.46" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Hamster Wheel (No Bracket)