Seat is stress-resistant flame-retardant polyurethane in varied densities and polyester fiber on hardwood frame. Back is injected flame-retardant polyurethane foam and polyester fiber. External backrest supports and legs are tubular steel with chrome finish or powder coat; transparent PVC glides. Pipe collection covers are not removable.External structure: chrome-plated or powder-coated steel.Backrest: cold-injected polyurethane and polyester fiber.Seat internal structure: wood.Seat: differentiated-density polyurethane foam and polyesterfiber.Glides: transparent PVC.