Zig Zag Spring Also call sofa spring, seat spring, sinuous spring, serpentine spring, s ... , no sag spring, etc Zig Zag SpringMostly used in sofa, seat, chair and such usages. over 90% of ... china.good quality, competitive price, swift reply We are metal products manufacturer and exporter in China, we offer spring ... ,we offer zig zag spring, bonnel spring for sofa , seat, mattress and other furniture.