High Quality Steel Metal Line Sofa 3464 1,Tight sofa upholstery 2,Solid wood inner structure 3,High density foam 4,OEM Av P ... polyurethane, natural down and superfine fibre, which make the sofa elastic, and feel comfortable.Surface material: selected natural aniline ... : S shape spring, natural rubber bandage. Chair seat, back seat and chair arm: long range elasticity polyurethane, natural emulsion ...