Innovative school stack chair features molded seat with vented back has reinforced ribbing in back and under seat for strength. 14-gauge tubular steel legs and steel lower back support. Full MIG welded frame. No penetration through the seat surface. SuperGlide composite ball glides for durability and protection on hard floors and carpet. Our school stack chairs QUICK-ship! Choose from scratch-resistant chrome in 8 colors, or Black or painted legs in 4 colors. Safety tested.