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This 28" X 36" (0.71 m x 0.91 m) nylon alpha flag allows boaters, jet skiers, and watercraft operators know that divers are in the area and keep clear. The alpha flag is the true international flag recognized around the world as the signal to boaters that divers are below. If you have only the U.S. red and white striped dive flag on your float, you should also carry this when diving abroad.