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About YiSen Springs YiSen Spring manufactures and distributes mechanical springs, wire forms, stampings and fourslide parts worldwide. We offer an extensive product line of more than 25,000 inventoried products in a variety of materials available in stock and ready to ship today. In addition, we also manufacture springs made to your specifications. From short run prototypes to long run production, we can support your needs when and where you need it in the world. YiSen Spring is the premier global source for stock catalog and custom designed mechanical springs and related products. We make it ...