15 foot Tip and Roll 3 row portable school bleachers are made to roll in place. As school events change tip and roll bleachers go where they are needed on commercial casters. At 15 feet wide x 3 rows of 2 x 10 Aluminum Planks, this bleacher seats 30 adults and is only 30 inches high. This 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 and includes a wood sill to protect floors. NOTE: Please check your local building codes to determine required specifics for portable bleachers. Guardrails and additional foot boards are available.