Sold in sets of 4. These rollerblade wheels are the base that the Cat Exercise Wheel rests on. They're made of a soft material that can be worn down over time as your cat runs on the wheel. It's important to use roller blade wheels as the soft material is very forgiving and absorbs any bouncing motion caused by pouncing paws.

Compatible with older & latest generation models of the exercise wheel when used with 4th/5th gen base panels and 5th gen wheel covers.