It is very resilient and made out of fir. It has a very strong foundation and is roofed in sisal so kitties can scratch at it. They may be meant to be simple to wash and really sturdy. Are they well worth the money? Will your cat even use https://cat-treadmill-wheel47912.ssnblog.com/26317964/helping-the-others-realize-the-advantages-of-cat-exercise-wheel-treadmill