Progressive 412 Shocks For Harley V-Rod The 412 Series shocks are simply the best value shock on the market. Their simple, durable design will stand the test of time and improve your motorcycle's suspension performance for as long as you're riding. They feature a double-wall steel body construction with nitrogen-charged, multi-staged, velocity-sensitive valving for smooth, consistent damping. A cam-style preload adjuster lets you dial in your ride whether you're a light or heavy rider. Features: 5-position cam style preload adjuster High Pressure Gas Charged for consistent damping performance Standard or Heavy-Duty progressive rate springs Available in chrome or black Backed by a one-year limited warranty