The classic Keel, everyone has either ridden, seen or held one before! 
First originating in San Diego CA in the mid-late 60’ surfer and designer Steve Lis brought kneeboard design of short wide and volume full boards to the mainstream in a fun board for small rampy waves.
Much like its name suggests the keel is a parallel, cruisey keel fin twin for long points or beach breaks. The keel has even foam throughout giving the board a much larger feel then they often are. The swallow tail when on rail holds the board on the face as each swallow acts as a pin when going through turns. This angle allows the board to feel holdy and allows projection when getting around sections or laying down turns on the face.