FCS II Fins JS PC Medium Tri-Quad Fin Set

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As either a tri or as a quad, the FCS II JS PC Tri-Quad Fin Set is for power surfers that like to surf on rail and push hard through turns. Recommended for boards with deep concaves and moderate-to-extreme rocker, the JS PC Fins from JS Surfboard shaper Jason Stevenson, have an elongated base and high sweep angle paired with a relatively narrow tip. This combination allows for easy release and controlled direction changes. Performance Core construction delivers a stiff and responsive fin that is incredibly lightweight. Particularly good in point and reef breaks, the JS PC Fins deliver a smooth ride with exceptional flow and drive.

What I like about this fin is just the speed and flow that it has, then if you want to push it a little harder it has the release too. To put it simply, it’s just really reliable” - Jason Stevenson


Performance Core construction features an updated large hex core that reduces weight, resulting in a lighter and more responsive fin. The stiff flex pattern extends progressively from the base through to the tip helping the surfer to maintain drive and hold through a turn. PC fins are reliable, very responsive, and can be used in a variety of different conditions.

Tech Specs


  • Base: 4.53 in, 115 mm
  • Depth: 4.53 in, 115 mm
  • Area: 15.08 sq in, 9730 sq mm
  • Sweep: 36.1°
  • Foil: Flat


  • Base: 3.83″ / 97mm
  • Depth: 3.99″ / 101mm
  • Area: 11.08″² / 7150mm²
  • Sweep: 32.4°
  • Foil: 80/20


  • Size: Medium
  • Fins in set: 5
  • Material: Performance Core
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If you are not 100% satisfied with your purchase you may return it for a full refund, or exchange within 30 days of receiving your order.