Durable Material Innovations: Exclusively developed heavy duty rubber material, durable beyond imagination, provides enhanced traction on different surfaces. Metal Insert Reinforced: Built to last with extra 2mm Stainless steel insert, the 20 times more durable than ordinary rubber Easy Install Crutch Feet:No tools required, remove the old tip,push down the new one, done Shock Absorbing&Anti-slip: Innovative tread pattern & deep grooves bottom absorbs impact, indoor and outdoor universal. workmanship make Each step will more and more secure. Shock Absorbing: Heavy duty workmanship make Each step will more and more secure