The framework of our high quality Aluminum Bleachers is constructed from welded aluminum angle material. Seat planks are 10" wide mill-finished aluminum. Available in 2 and 3 row models, 15' and 21' long. These top-of-the-line bleachers meet the safety standards of the NFPA (National Fire Protection Agency) and CPSC (Consumer Products Safety Administration). Light assembly required. Limited 5-year manufacturer's warranty.