FCS II Fins MB Split Keel Quad Fin Set

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Throw the FCS II MB Split Keel Quad Fin Set into your wide tailed surf craft and feel it come to life. As Matt 'Mayhem' Biolos's specialty quad fin set, the Keel Quads are fully designed for maintaining control through rotations and snaking carves. Offering quick, loose turns, these quads have just enough bite to wrap around solidly while reserving speed for the next section. Excelling in big, open faces and clean, down-the-line waves, the MB Split Keel Quads supply you with high surface area and a stiff base that will enable superior command underfoot.


Performance Glass (PG) material characteristics and flex pattern are identical to traditional fiberglass fins offering a stiff base with subtle responsive tip flex, amazing aesthetics, and proven durability. PG fins are the perfect transition fin for surfers moving from fixed fins to the convenience, accuracy, and performance of FCS.


A flat inside face combined with a convex outside face. The traditional flat sided foil offers an even combination of drive, pivot and holds and provides a very consistent, reliable feel over a wide variety of conditions.

80/20 FOIL

Combines the performance of a center and side fin offering increased speed, smooth rail-to-rail transitions, and a consistent feel in a variety of conditions. (Ideal for all board types and rear fin placements)

Tech Specs


  • Base: 4.63 in, 117mm
  • Depth: 4.79 in, 121mm
  • Area: 19.27 sq in, 12432 sq mm
  • Sweep: 44.8°
  • Foil: Flat


  • Base: 4.03 in, 102mm
  • Depth: 4.40 in, 112mm
  • Area: 12.63 sq in, 8150 sq mm
  • Sweep: 28.5°
  • Foil: 80/20


  • Size: Fit to Board
  • Fins in set: 4
  • Material: Performance Glass


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