Century 400 Ninja 12" Wheel For Carpet cleaning Machine 5/8" and 1/2" axles 98407770 Fits all Prochem and Windsor equipment using 12" tall wheels. Includes one plastic bushing to convert 5/8" axle hole to 1/2" axle hole. Sold each, photo only has two wheels to show each side of one wheel. It will not look the same as the original wheels. The original style is discontinued. also marketed as 89252 and ce89252 and 98407770