.. Framesare 100%welded aluminum angle.. Features 2" x 10" anodized aluminum seat planks and 2" x 10" mill finished foot planks on all rows.. Comes with Safety End Caps -No sharp edges to snag clothing or skin... Bleachers can be transportable or fastened to a concrete slab (fastening hardware not included).. Some assembly required.. Due to constantly changing specifications, please check local building and safety codes to ensure compliance. ..