Karman Healthcare eight-inch casters are suitable as replacement wheels for any wheelchair, transport chair, rollator, or walker. The large eight-inch Black colored wheels are non-marking and are perfect for both indoor and outdoor use. Poly-urethane solid casters allow individuals to use the wheels indoor without worry of marking interior surfaces such as tile, or carpet. Compatible with most rollators with bearing size 5/16", the C4608 is a suitable OEM replacement at a cost effective price point.