Check out our selection of Greenough Fins at trueames.com Our most popular Greenough fin is the 4-A: The full base coupled with the tapering, moderately flexible tip creates a balance that transcends and complements so many aspects of surfing. Of course a unique understanding of his aquatic fish friends is the foundation here. Install the 4-A on any performance surf vehicle and you will find instant bliss. Currently available with matte finish. SMALLER SIZES ( 7” - 9” ) Use the smaller sizes for a single fin or 2+1.