This is the Trident Nylon Alpha Universal Dive Flag with Grommets Features: Dimensions: 20 x 24" (50.8 cm x 61 cm) Made of Durable, Stitched Nylon Brass Grommets for Easy Installation Increases Dive Safety Alpha Flag: True-International Diver-Down" Flag Recognized Around the World The Alpha flag is the true international diver-down flag recognized around the world as the signal to boaters that divers are below."