Low Profile Water-Weights are so convenient to use! These portable, pumpless ballast bags hold up to 50 pounds complementing existing ballast and wake shapers to fine-tune your boat’s wake for wakesurfing. Use in smaller places on your boat, like under seats and benches; keeping floor space clear of clutter. With its “dip & zip” feature, just fill a bag with lake water, use for ballast, and dump when you’re done. No pumps needed! Two durable handles make it easy to move around. Water-Weights are modular, manageable, and weightless when not in use. Clumsy lead or sandbags continue to weigh you down and use extra fuel after you’re finished with your water sports. The large waterproof zipper makes them easy to fill and easy to empty. Folds flat when not in use. Shiny Silver Metallic Design. Made of Vinyl.