Knee Walkers are an excellent alternative to crutches and designed to keep you active and moving. With a rugged, steel frame and four large, knobby wheels with tires specifically designed to never go flat. Its extremely stable for indoor or outdoor use and maneuvers easily over gravel, dirt, grass, mulch, and uneven pavement. Built for use with the right or left leg, this knee walker's unparalleled versatility and durability provides adjustable features to make your ride on any terrain comfortable and smooth.