Hamster Exercise Ball 3.9 Inch Silent Dwarf Hamster Reel Hedgehogs Kids Non-Toxic Plastic Spinner E7CBOOTDTYCutches: Made of high quality plastic, non-toxic and safe. Simple and convenient to assemble, it is a good toy for playing and exercising with the mouse. Running can relieve hamsters' anxiety and stress so they can be confident. Let the mouse go to "play".The diameter of the ball is about 3.94 inches. Suitable for dwarf hamsters, mini gerbils, children's squirrels, young hedgehogs and other small animals. Reinforced structure, durable and not easy to break. Multiple vents ensure good ventilation. Removable cover, you don't have to worry about small pets falling out. Easy to clean. We offer 4 colors blue, red, yellow and transparent. Specification: Material: Plastic Color: Blue/Red/Yellow/Transparent Size: Diameter About 10cm / 3.94in Weight: Approx.48g Package Included: 1 Pc. Hamster Reel (Blue/Red/Yellow/Transparent)Note: 1. Please allow 0-1cm error due to manual measurement. Pls make sure you do not mind before bidding.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!