This 27 foot 5 row bleachers with 4 inch vertical bar guardrail will add seating to your school or sporting event. Seats and double foot board aisles are made of 2x12 anodized aluminum planks with room for 90. This light weight bolted aluminum frame provides strong joints that will not develop weld cracks. The low rise is 6 inches per row which is comfortable for adults and children. This set includes guardrails and full foot boards with risers for safety. NOTE: Please check your local building codes to determine required specifics for portable bleachers.