5 inch urethane walker wheels with leg extension. New improved wheel technology. Walk naturally with no need to lift walker. Use on the front legs of a walker. Wheels fit Carex walkers A846, A847, A848, A856, A857. Also fits other manufacturers' walker products. In-line skate technology provides proven performance. Roller bearings for smooth rolling action and improved maneuverability. High impact urethane for durability and wearability. Clear translucent color for an aesthetically pleasing look. Eight one inch increment height adjustment.