If you are a Floridian Diver or are planning a trip to Florida, the Florida Keys or the Caribbean, this I.D. card is a must for underwater identification. This full-color invertebrate identification card allows you to know what local wildlife you are looking at when you see it. Card is waterproof and easily stored in your BCD pocket. This 6 X 9 inch (15 x 23 cm) plastic slate depicts 60-plus invertebrates in color drawings, and is hole-punched to secure a lanyard for underwater use.