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, garage torsion spring, garage door torsion spring for above 8 years, our main products, garage torsion springs, garage door torsion springs is bonnell spring, serpentine spring for mattress and sofa usages, compression spring, extension spring, torsional spring, leaf spring, garage torsion spring, garage door torsion spring and other kinds of springs for automobile, machine, artcraft and other usages. Because of skilled workers, advanced equipments, strict management, our products, garage torsion springs, garage door torsion springs, garage doors torsion spring, garage door torsional spring, adjusting garage door torsion spring, adjust garage door torsion spring are of high quality and they are warmly welcomed by our customers from domestic and abroad of China.