Tip N' Roll Bleachers are perfect for auxiliary seating, and come with double foot planks for added stability and comfort. The frames are 100% welded aluminum angle, delivering a sturdy set of bleachers. The unit easily tips up on its casters for convenient storage. The high grade swivel casters & rubber foot pads will not mark your floors. Seat planks are either anodized or powder coated (where applicable). Comes with 5-year guarantee.