Plyo Boxes are made with 1" thick 15-gauge welded tubular steel. The landing surface is 3/4" plywood covered with a 1/8" non-skid rubber slip-resistant pad. Legs are constructed at a 6 degree angle to prevent tipping. Available in 5 sizes (6", 12", 18", 24" or 30" tall) or in a set which includes 1 of each size. The 24", 30", and the set are shipped freight.