The MOA Modular Shooting Rest Set comes with four components that allow you to adjust the height of the rest to suit your environment and individual shooting style. The V-shaped trough on the top module securely grips the forearm of any rifle, and the top and bottom modules are filled with polymer pellets which add weight and solid positioning. The two center modules use dense shock-absorbing foam. All the modules are held together with hook and loop fasteners to ensure that the modules will stay in place during repeated shots. The ballistic nylon shell is tough, but won’t mar firearm finishes or delicate surfaces, such as the clear coat on your hood.