Students must use upper- and lower-body strength to traverse upside-down from one end of structure to the other. And because climbers are only inches off the ground, it's safer than vertical climbing challenges. (Use at least 2" (5 cm) thick mats. See Mats section.) Each unit handles students up to 250 lb (113 kg), but is light enough for 2 people to move. Steel/aluminum frame with powder-coat finish. Some assembly required. For middle elementary and up. 10'L x 5'W x 32"H (3 m x 1-1/2 m x 81 cm); 125 lb (57 kg). Truck delivery.