... ,low-carbon 4.OEM,SGS,LGA,ISO sofa set/home sofa/leisure sofaMaterial Main structures:hardwood frame+high-density foam+nut-brown wood ... +foam+spring+solid wood. Frame:1)The frame inside is rather firm, 2)Hardwood frame in precise design,The frame is specially treated by ... ,shrinking or changing shape. 3)The water content of the frame is 11%-13%;meeting the international requirements. Cushions:most of ...