National Public Seating's 8100 Poly Shell Stack Chairs are durable and affordable enough for all your school’s classrooms. Students will enjoy sitting on the comfortable one-piece, high-density polypropylene shell. Plastic frame-shields protect children from snagged clothing and pinched fingers. The chrome-plated, 17-gauge steel frame features three cross braces for added strength. Stack these school chairs up to 12 high to save on storage space. Available in a selection of colors to complement any room. To create straight rows of seating, add optional ganging brackets.