Tubular steel frame, front and rear leg braces, polyethylene leg caps. Contoured one-piece seat-pan consists of steel with a curled lower edge. Curved steel backrest panel is curled along the full width of its bottom edge. Optional ganging device consist of steel ganging brackets. All brackets are welded to the frame. BIFMA, GreenGuard, CPSIA. All steel folding chair with five year warranty. ONLY SOLD IN CASES OF 4 CHAIRS. Super heavy duty construction, with long lasting powdercoated finish. Usually ships within 3-5 business days.