1st Class flat iron profile 20x20x1 mm; 15x15x1 mm extra support on the legs; 11mm OSB (Oriented Strand Board) Wood on seat and back; 3mm duralite (BACK); 1,2mm White Sponge on the front (BACK); 0,5mm White Sponge on the back (BACK); H:50mm (320-350gram) 40x40mm 1.st Class PU foam (angled corners) (SEATING); Easy to Stack Up to 18 Pieces; Dimensions: 44x58x92 c