21' Long Powder Coated Preferred Aluminum BleachersThese are perfect for indoor outdoor auxiliary seating requirements. These preferred units feature double foot planks making it easier to find a seat. Frame work is welded aluminum angle. Seat planks are 10w anodized aluminum & foot planks are 10w mill finished aluminum. Add some team spirit to your bleachers with these powder coated aluminum bleachers. Features: The 4 and 5 row bleachers come with a commercial grade 9 gauge steel mesh guardrail