... is made of stailess steel. 2.experice making sofa spring cushion for 8 years 3.any size is available. we ... 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 ... sofa cushion or chair10)quantity: up to customer request sofa spring cushion