Flat foil on the side fins delivering fast, controlled directional changes. RTM which means they're made in a mould with fiberglass and resin. Fin System Compatibility: FCS II Fins: 5 Fin Tri-Quad Set Size: Large Material: Fiberglass Color: Graphic We Carry A Full Line Of Gorilla products Here. The item "Gorilla Sloth Palm Shank Surfboard Tri Quad 5 Fin Set Large FCS II Fins" is in sale since Wednesday, July 12, 2017.This item is in the category "Sporting Goods\Water Sports\Surfing\Surfboard Fins". The seller is "ratz_azzz" and is located in Los Angeles, California. This item can be shipped worldwide.