This complete ballast bag + pump combo will instantly create the results you are looking for. Adding 1,300 lbs. of additional weight to your boat will help create a more sizeable wake for both surfing and wakeboarding. The 400 lb. bags can be placed in the rear locker of smaller v-drive boats or alongside the engine compartment in direct drive boats. The included 3700GPH Telescope pump makes for quick fill/drain times while out on the water (less time waiting around and more time riding). This bag + pump combo has everything you need to get out on the boat and build a better wake.