This 15 foot 3 row portable school bleacher features 2 x 10 plastisol planks and seats 30 adults total. Features a galvanized steel frame that is made from alloy steel angles using full welds at all joints to give added strength. The low rise is 7 inches per row which is comfortable for adults and children. NOTE: Please check your local building codes to determine required specifics for portable bleachers. Does not include guardrails.