Aluminium profile 25x25x2 mm; Seating Part 14mm OSB Wood (Not Particleboard), BACK PART PAPELL; Fully welding which provides more strength in the foot profile (Not Spot Welding); Back front sponge, 32 density gray sponge; Seat foam, 7cm cast polyurethane with 55 density hardness; Back Back 3mm duralite on 1cm white sponge, covered with upholstery fabric; Easy to Stack Up to 8 Piece