Feature: 1. The running ball has a transparent appearance, you can clearly see the hamster state when the hamster exercises, and you can play with the pet to increase the fun. 2. Animal activity toys are made of high‑quality plastic, light in weight, environmentally friendly, non‑toxic and . 3. It provides a safe and comfortable space for hamsters, easy to clean and resistant to odors. 4. The vent adopt embedded in design, through the vent, the hamster will not suffocate and die when running indoors. 5. The large diameter of 33cm/13.0in is suitable for more pets, and can be used by large, medium and small hamsters. Specification: Item Type: Hamster Running Ball Material: Plastic Product Diameter: Approx. 33cm/13.0in Weight: Approx. 1400.0g/49.4oz Purpose: Hamster Play/Exercise Package List: 2 x Half Ball 2 x Connecting Piece 1 x Screwdriver 10 x Screw