The wheel has sisal on The within and out but though the cushioned pads may be taken out, the carpet can’t. The wheel provides a twenty-inch diameter, so is admittedly only ideal for tiny cats and kittens, and it will hold a highest cat body weight of fifteen kilos. https://treadmill-wheel-for-cats39528.fitnell.com/67430398/little-known-facts-about-cat-treadmill-wheel