This is a 35cm diameter acrylic exercise wheel. I used it for my chinchilla. Also included are the step platform (aluminum and wood) in the photos, and sand as a bonus. I have used it for about 3 years. There are scratches and dirt from use. There are no problems with use. The following is quoted from the website: This is a large 35 cm diameter exercise wheel suitable for larger small animals such as ferrets, guinea pigs, chinchillas, degus, and prairie dogs. The most important thing for pet toys is that pets can play safely. In general large exercise wheels, there are many serious accidents where pets get their feet caught in the mesh or steps, or get their feet or bodies caught in the bearing part. This exercise wheel is made of flat, transparent acrylic with no mesh or steps, so there is no worry that pets will get their feet caught and get injured. It is also easy to clean and can always be kept in a clean condition. Also, there are no places where feet or bodies can get caught, so such serious accidents will not occur. Since the whole thing is transparent acrylic, it does not block light from the surroundings and keeps the inside of the cage bright. To prevent pets from biting it, the edge of the exercise wheel is protected with an aluminum alloy, which protects the health of the pet and allows the exercise wheel to be used for a long time. The mounting part is made of rust-resistant stainless steel. It has a quiet design that uses high-quality bearings, so you can use it with peace of mind even in your home. Attaching it to the cage is very easy, just fix it with the 4 screws on the back. When attaching it to an acrylic or wooden case, you will need to make holes in the case for the 2 bolts in the center of the back and fix it there. Diameter: 35 cm Depth: 17 cm (body depth 12 cm) Weight: 1600g Regular price: 15,800 yen