Aluminum die casting, waterproof and rust proof, lightweight and strong compression ability, free adjustment of back Angle, five Angle groove integrated die casting, hollow pattern integrated molding, the overall smooth without burr, all solid wood, solid and durable at the same time more Nordic style, smooth handrail, beautiful arc, smooth and delicate, no burr no rust, comfortable grip, back cast aluminum, hollow pattern, integrated casting, Water and sun and no rust, cast aluminum roller design, easy movement and easy carrying, and plastic tires with shock absorption function.