These outdoor bleachers are built for a lifetime of dependable  trouble-free sports seating…Weatherbeater bleachers come with recycled plastic ground runners to keep support framework raised from grass or dirt • Recycled runners will not rot like wood runners used by other manufacturers • Available in 7½'  15' or 21' lengths in either 3 or 4 tier heights • 2 tier bleachers are only available in 15' lengths • Heavy-duty 2" x 10" anodized aluminum seat planks • 100% aluminum welded support structures • Planks have end caps for a finished look without sharp edges • High grade zinc plated hardware • Add color planks at an additional cost to customize your field (see BL07SEAT1 for 7-1/2' plank options or BL15SEAT1 for 15' plank options) • Five-year limited warranty on structure  two-year limited warranty on planks.