Bullet Ski Lines 550 or 350 lb Ballast Bag w/ Cover. Load out your boat with our portable wake enhancement kits when you are wakeboarding and add even more when wakesurfing. Our wake enhancement kits allow you to take it out and fill when you need that crazy huge wake, and stow it away when you are done. This kit includes a 30 Gauge PVC bladder and heavy duty cover to help avoid puncturing. The bladder has 2 drain/fill holes with valve flaps that open when the pump is inserted and close off when the pump is removed; each valve also has a rubber cork and screw on cap. Our heavy duty cover has 2 easy access holes for the fill and drain valves, heavy duty zipper, and straps for repositioning when full Add our Ballast Bag pump kit; Our kit will fill or empty your fat sac at 107 lbs per minute. Features: 550 or 350 lbs Ballast Bag Cover with straps and access holes Thick 30 Gauge PVC Bladder 51" Long x 19" Diameter