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 ... offer spring tines, rubber track, rubber belt and other agri parts for harrow , tedder, rake, baler, harvester, cultivator and ... ,we offer zig zag spring, bonnel spring for sofa , seat, mattress and other furniture.