This Tip and Roll portable school bleacher is 15 feet wide with 3 rows of 2 x 10 aluminum planks. Seats 30 adults for sporting and school events. These portable school bleachers are made to roll in place to easily move equipment in a gymnasium or on the field. The light weight bolted aluminum frame provides strong joints that will not develop weld cracks. The Rise is 7 inches per row which is comfortable for adults and children. Comes with a set of four no marring 5 inch casters with brakes preventing any markings on the floor. NOTE: Please check your local building codes to determine required specifics for portable bleachers. Guardrails and additional foot boards are available. If you have any questions please give us a call.