Frame work of 20mm (34”) C.R.C tube, 16 gauge wall thickness.Stack upto 12 Chairs.Seat & back of ½” ply wood without exposed fasteners.32 density U Foam on back, 50 mm thick 40 density U Foam on seat.PVC Studs on the underside of frame to protect surface during stacking. * MS CRC Powder Coated