The Premium Black Water Tube Kit for In-Ground Swimming Pools includes enough eight-foot and ten-foot tubes to completely surround the perimeter of your pool cover. Only Premium extra-heavy-duty black no-roll double-chamber water tubes are included in this kit. Robelle Premium water tubes are constructed of extra-heavy-duty 20-gauge puncture resistant vinyl. These tubes feature a leak-proof valve that is easy to fill with a garden hose. Water tubes should be filled halfway to prevent popping caused by expansion if the water freezes. This is the only tube kit with enough tubes to cover 100 percent of the perimeter of your pool cover — just choose the kit that matches your pool size.