About this item 【Density Fiberboard】: Made of furniture density board, sturdy and durable, safe and eco-friendly, strong load-bearing. The inner lining of the cat wheel is a plush carpet with velcro, which is comfortable, convenient and easy to clean. 【Cat Exercise Wheel Size】: Overall Dimensions: L x W x H, 《S》80cm(31.5″) x 30cm(11.8″)x 88cm(34.6″). Recommended for Cats Less than 3kg (6.6lbs) . 《M》90cm(35.4″) x 30cm(11.8″)x 97cm(38.2″). Recommended for cats of 3-5kg (6.6-11lbs). 《L》100cm(39.4″) x 30cm(11.8″)x 107cm(42.1″). Recommended for cats of 5-8kg (11-17.6lbs). 《XL》110cm(43.3″) x 30cm(11.8″)x 117cm(46.1″). Recommended for cats of more than 8kg (17.6lbs). 【Low Noise Pulleys Design】: Equipped with silent wheels, cat wheel runs more quietly, comfortably and smoothly at night, does not affect the owner’s sleep, and can be placed indoors without side effects. It can also stop automatically after running. 【Multi-purpose】: Consisting of a wide base and large round wheels, this treadmill is stable and can accommodate cats of all sizes to run, spin, scratch, climb and nap. Not only will it protect their health, but it will also reduce their boredom. 【Easy to Clean】: The inside of the wheels is covered with terry carpets secured with velcro and can be easily removed for easy cleaning. Just wipe the wood with a damp cloth.