This double ramp from Airwalk is curved for a smooth transition and taller jumps. Easily assembles in minutes. High impact pp material. Made of polypropylene. W42.2, D16cm. Maximum user weight: 90kg. No assembly. For ages 8 year and over. WARNING(S):Only for domestic use. To be used under the direct supervision of an adult. Protective equipment (helmet, knee pads, elbow pads and wrist guards) should be worn, not to be used in traffic.