1.The South Korea waterproof nylon material 2. aluminum alloy bars, inside the cotton cloth 3. copper zipper head 1.Apply waterproof wash water fabrics, itself is lighter.2.The use of special strengthen thick zipper, use rise more at ease.3.The handle strengthened with cotton, design comfortable.4.Resistance to fall off, bearing wheel5.Aluminum alloy two type bars, can be arbitrary regulation.6 . ...