This is an acrylic hamster wheel from EnergyPower, purchased on Amazon. Diameter: 35cm, Depth: 17cm (Body depth: 12cm) Silent design Made of transparent acrylic, it doesn't feel bulky even when placed inside the cage. It also makes it easy to observe your pet running. I used it with a "SANKO Easy Home EVO 80" cage. I used it for about a year and a half. In addition to the main support, I attached tires to the cage to prevent shaking, so there are faint marks from the tires. (See photo 6) There is some wear and tear, but I don't think there are any noticeable scratches. Please understand that this is a used item before purchasing.