The exciting Discovery Mountain puts a rock climbing adventure in your own backyard. Molded from durable plastic, the amazing accessory will add unlimited play value to your backyard playground. Weight limit: 450 lbs. It can be used with the 4' and 5' deck heights. Top width: 22-1/4". Bottom width: 30". Height: 60". Required materials: (3) 2x4x8 Grey. ASTM certified.