Use this Eight.3 ballast system underneath your seats, in your locker, or on the bow to maximize the wake behind your boat. The trapezoid ballast bag features an anti-roll shape that won't move around your boat while you're out wakeboarding. This simple, fast ballast system works easily with the Eight.3 1200GPH pump system, so that after pulling the plug, you're ready to play. Heavy-duty, 60-gauge tarpaulin material includes high-strength, sonic-welded seams for the utmost in durability. Designed with four 1" external fill/drain/vent ports. 50"L x 22"W x 18"H.