The CSE has four height settings, approx. 12 inches tall on the lowest setting and 13.5 inches tall on the tallest. Outside diameter is 11.2 inches and the inside to inside diameter is 10.3 inches.The stand is 11.5 inches wide and 8.5 inches long. The running surface is 3.8 inches wide. The dual bearings are not exposed to the inside of the wheel so you don't get them wet while cleaning the inside of the wheel. The screws are stainless steel so they don't rust. It's made from durable plastic and it has a lip around the rim to help prevent warping. Safe, silent and easy to clean. Great for Syrian hamsters, STO's, rats and smaller sized hedgehogs.