1.sofa spring cushion is made of stailess steel. 2.experice making sofa spring cushion for 8 years 3.any size is available. we are specialzing in manufacturing comprssed pocket spring, sofa spring cushion ,pocket coil for sofa, sofa cushion spring, pocket spring, pocket cushion, sofa spring, seat spring, zigzag spring etc.sofa spring, pocket spring,coil spring1).Diameter: 1.6-2.1mm2)hight:8-26cm3 ...