Portable indoor bleachers provide a mobile solution to seating needs in a wide range of indoor applications and can be used outdoors when desired… When in use  Easy Store bleachers rest on non-marking rubber feet • Just lift front to tilt bleachers onto stable 3" diameter transport casters • Choose from 7-½'  15' or 21' lengths in various heights • Heavy-duty 2" x 10" anodized aluminum seat planks • 100% aluminum structure • Planks have end caps for a finished look without sharp edges • High grade zinc plated hardware • Five-year limited warranty on structure  two-year limited warranty on planks • Add color planks at an additional cost to customize your court (see BL07SEAT1 for 7-1/2' plank options or BL15SEAT1 for 15' plank options)