VON SOL STANDARD NUBSTER (FCS)
The Nubster fin was a developed as center fin addition to eliminate squirly effect associated with your quad-fin boards without the loss of free movement. The fin was made famous during the Quiksilver Pro New York contest , where Kelly Slater used the 5th fin on his quad. According to Kelly's report "that fifth fin just tightens and smooth's the whole thing up." which is the basis for the fin design.