The AST 5100 Series Shock Absorbers Non Coil Over BMW 1 series - E8X w/ Formed Springs for OE Mounts are designed for performance and comfort. These shocks feature a monotube design with a 46mm piston and a large displacement volume for improved damping. The shocks are also adjustable for rebound and compression, allowing for maximum flexibility and control over the ride quality. The shocks come with formed springs that are designed to fit the OE mounts, making installation easy. The shocks are ideal for street performance and track use, providing excellent control and comfort.