Modern Barcelona Wooden Frame Chair With Ottoman 1,Tight sofa upholstery 2,Solid wood inner structure 3, ... exists.Elastic:1.the elastic at the saddle should be with high elasticity2.thick is more than 2mm;3. transverse space ... . Elastic fittings: S shape spring, natural rubber bandage. Chair seat, back seat and chair arm: long range elasticity polyurethane, natural emulsion, natural ...