Standard Steel Springs in a wide variety of spring weights and travel. The 35 mm/1.385" Internal diameter also fits DVO, MRP and X-Fusion shocks.Features-Internal Diameter: 35 mm/1.385"-Spring markings: 400 lbs x 2.80Item Specifications-Spring Weight:400-Material:Steel-I.D. (mm):36.5-Stroke (ins):2.5-Stroke (ins):2.75