Made In USA. Street to circle track, OEM to drag race performance, Melling valve springs cover the market and your requirements. Standard, mid-range, heavy-duty and race ready applications are available from Melling in a variety of wire sizes, materials and spring pressures. Melling spring designs include standard and dual springs with and without dampers as well as new beehive applications. Whatever your valve/rocker spring needs may be Melling has a variety of quality valve springs to fit your requirements. Additional Attributes: GTIN: 00729295200864 Material: Corrosion Resistant Steel Coil Bind Height: 1.150 Spring Open Height: 1.200 Open Pressure: 155 Inside Diameter: 0.951 Outside Diameter: 1.305 Grade Type: Regular Closed Pressure: 57 Spring Type: Single Spring Extened Information: Emissions : Legal US Life Cycle Status: Available Only While Supplies Last Packaging: Quantity of Each: 4.0 Package UOM: EA Dimension: 5.0000 x 3.5000 x 2.0000 inches