3.4" Classic Stabilizer Fin – FCSII Compatible black Pro Glass.

3.4" Classic Stabilizer surfboard fin for twin + trailer setups. FCSII compatible black Pro Glass fin designed for smoother control and added hold.

This fin help when you ride:

• Twin + trailer boards: adds stability without slowing the board down.

• Twin fins that feel too loose: improves hold and drive.

• Mid-length twin setups: creates smoother rail control.

• Fish or hybrid twin boards: adds more predictable turning control.

Add control to your board without killing the speed.

The Eveley 3.4" Classic Stabilizer is designed to sit behind twin fins to provide extra hold, smoother rail engagement and better control through turns, while keeping the fast, flowing feel twin setups are known for.

Constructed from durable Pro Glass fiberglass, this stabiliser delivers a solid, dependable flex pattern trusted by surfers who want classic twin speed with modern control.

✅ Fin System: FCSII compatible
✅ Fin Type: Stabilizer / trailer fin
✅ Setup: Twin + trailer
✅ Installation: clicks into any FCSII center plug

Description

The Eveley 3.4" Classic Stabilizer Fin is designed for surfers running twin + trailer setups who want the speed of a twin with a touch of extra control.

Placed behind the twin fins, the stabiliser improves rail hold, smoother transitions and more predictable turning, especially in steeper waves.

The Pro Glass fiberglass construction provides a slightly stiffer flex pattern compared with honeycomb fins, producing reliable drive and strong hold through turns.

Its classic curved template complements traditional twin setups while remaining versatile enough for modern twin hybrids and mid-length boards.

Specs

Height (depth) 3.4” Base 3.66” Foil 50/50 Cant 0 degrees.

Construction Pro Glass Fiberglass, Fin Type Stabilizer / Trailer, Fin System FCSII compatible, Colour black

This template behaves as:

• balanced stabiliser

• moderate rake for drive + control

• suitable for 2+1 or twin + trailer setups

Performance & Sizing

A 3.4" stabilizer is considered the classic size for twin + trailer setups.

Smaller stabilisers:

• maintain twin fin speed

• increase hold and drive

• reduce sliding through turns

Compared with larger center fins, a stabiliser keeps the board loose and fast while improving control.

Surfboard Fin Knowledge Hub

Learn more about choosing the right surfboard fins:

• Surfboard Fins – Complete Buyer’s Guide Surfboard fins explained for Australian surfers. Learn fin types, sizing, materials and setups, then shop high-performance fiberglass fins from Eveley Australia. Thruster, twin, quad and longboard fins explained.
• Beginner’s Guide to Surfboard Fins New to surfboard fins? This beginner-friendly guide explains fin setups, sizes and materials so you can choose the right fins for stability and control.
• Surfboard Fin Size Guide Confused about fin sizes? Discover the simple rules pros use to choose the right fins for thrusters, quads, twins and longboards — and ride your board with more speed and control.
• Surfboard Fin Compatibility Guide Learn surfboard fin compatibility rules and how to identify your fin system. Simple guide explaining which fins fit FCS, Futures and center fin boxes.

These guides explain how fin size, template and setup affect speed, control and manoeuvrability.

FCS™ and FCSII™ are registered trademarks of Surf Hardware International Pty Ltd. Eveley Surf is not affiliated with or endorsed by Surf Hardware International Pty Ltd. All compatibility references to FCS and FCSII are for descriptive purposes only.