Kelly Slater with his signature FCS K2.1 quad fin set with FCS VS Knubster Kelly Slater quad stabiliser


11 x world champion Kelly Slater with his signature FCS K2.1 quad fin set with FCS VS Knubster Kelly Slater quad stabiliser


FCS Fins K2.1 Performance Core (PC) Quad surfboard fins


Kelly Slater’s signature quad set. K2.1 PC in the side and Q-1000 in the rear, exceptional performance in all conditions.

Performance Core material and construction is designed to deliver the feeling of a traditional fibreglass fin with the added performance of reduced weight. The RTM (Resin Transfer Moulding) process produces a lightweight fin with remarkable flex, a smooth feel and an impressive aesthetic.


Front Rear
Base iconBase: 4.33″ / 110mmDepth iconDepth: 4.53″ / 115mm

Area iconArea: 15.23″² / 9824mm²

Sweep iconSweep: 32.0°

Foil iconFoil: Flat

Base iconBase: 4.10″ / 104mmDepth iconDepth: 4.26″ / 108mm

Area iconArea: 12.64″² / 8158mm²

Sweep iconSweep: 32.4°

Foil iconFoil: Flat

FCS VS Kubster Quad Stabiliser


Developed by Sean Mattison for Von Sol surfboards, the FCS VS KNUBSTER is essentially a centre fin that can be added to any quad set-up. The fin will increase drive and provide directional control through turns without sacrificing speed, flow, or the freedom of movement typically associated with a quad. It’s designed with a single tab for the ability to move it forward and back based on drive.

The FCS VS KNUBSTER, which is 3 3/4″ by 2″ high, was the 5th fin Kelly Slater used on his quad during the Quiksilver Pro in New York. According to Kelly’s report, “The KNUBSTER will make your quad set-up feel faster, smoother, and it adds a little more control”.

Glass Flex Glass Flex

Glass Flex has been formulated to replicate the flex and memory properties of hand layed fibreglass. Its advantages over other composite fin materials include stiffness, a more positive flex pattern (nice tip flex, little base flex) and remarkable flex memory. The precision of the injection moulding process ensures the highest accuracy in geometry in each fin produced.

“The Knubster will make your favourite quad set-up feel faster, smoother, and it adds a little more control”-

-Kelly Slater


Base iconBase: 3.82

Depth iconDepth: 1.71

Area iconArea: 4.40

Sweep iconSweep: 32.0

Foil iconFoil:


About lunasurfshop

I love surfing
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