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-Spring markings: 550 lbs x 3.25"-Ultra-durable black powder-coat finish provides protection and keeps the spring looking goodItem Specifications-Stroke (ins):3-I.D. (mm):36.5-Material:Steel-Spring Weight:550