Chair surface is PU wear-resisting refractory high imitation leather Genuine leather or fabricBack for high-density polyester one-time forming high cold foam spring back fire spongeFor high-density polyester one-time forming high cold foam cushion spring back fire spongeSeat beams,chair foot, armrest for high strength aluminum alloy 6063 oxideRail for high strength aluminum alloy 6061 oxideAdornment to beams and rail head for PVC plastic resin materials