Increase load-bearing capacity: Strong structure to provide elastic support for the seat Easy installation: The overall design of the component is clear, and only basic tools are needed for easy running installation Elastic design: maintains its shape after a long time of use Multi-purpose application: Widely used for replacing the internal elastic support of sofas, chairs and other types of furniture 1 piece x zig zag springs for chair inside the packaging, size means length, wire dia is 3.5mm