Features: Bring endless running joy to your little hamster, even as your hamster runs around the track and the hamster wheel spins. Your furry critter will love this hamster wheel toy because hamsters love a hamster wheel like a runner to help break boredom and enrich their evenings, and also get them exercising to maintain their strength. Reasonable size running drum and wide track bring a relaxed back feeling as they don'for t need to bend their back while running, allowing them to enjoy endless running for time, helping them build their muscles and making them happy & mentally healthy. The sturdy base design makes it easy to use DIY cages, glass containers, glass tanks or put them on platforms. Durable plastic, with high transparency and chewiness, the sturdy design enables reliable standing and support while running or walking. Specifications: Material: Plastic Diameter: Approx.13cm/5.12in Color: Green, Blue, Yellow(optional） Type: With Holder, Without Holder(optional) Package Includes: 1x Hamster Running Wheel note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.