Race Tech Gold Valve Cartridge Fork Emulators For Harley Dyna / V-Rod Positioned on top of damping rods and secured by the main springs, emulators are tunable valves that enable damping rod forks to deliver performance similar to finely tuned cartridge forks. Features: Simple to install and tunable for all conditions and rider preferences Emulators are tunable valves that sit on top of the damping rods and are held in place with the main springs This makes them both simple to install and completely tunable for all conditions and rider preferences