Extension spring, s spring, machine spring manufacturer, supplier, factory, exporter--China Zhejiang Sanmen Herod Mattress Co.,Ltd., locates at the southeast of China, it is only one and half hour's drive from Ningbo airport and Hangzhou airport, very convenience at the transport and shipment. We specialized in making various of springs, extension spring, s spring, machine spring, extension springs, s springs, machine springs for above 8 years, our main products is bonnell spring, serpentine spring for mattress and sofa usages, compression spring, extension spring, torsional spring, leaf spring and other kinds of springs for automobile, machine, artcraft and other usages. Because of skilled workers, advanced equipments, strict management, our products, extension spring, s spring, machine spring, extension springs, s springs, machine springs are of high quality and they are warmly welcomed by our customers from domestic and abroad of China.