11" International 4A Center Surfboard Fin – Maximum Hold & Classic Trim | Blue on White on Red Pro Glass

Premium surfboard fins designed for classic longboard trim, powerful hold and smooth drawn-out turns.

If you ride a traditional longboard and want reliable hold, clean trim lines and confident noseriding stability, the 11" International 4A Center Fin is one of the most proven surfboard fins ever designed.

This classic surfboard fins template delivers smooth rail-to-rail flow and predictable control in a wide range of longboard conditions.

The 11" International 4A is a legendary longboard template trusted for decades because it simply works.

Its long raked outline delivers exceptional hold while maintaining smooth flowing turns. Whether trimming down the line or setting up for extended noserides, this fin keeps the board stable, predictable and fast.

Built from Pro Glass fiberglass with a blue / white / red colourway, it combines classic performance with dependable strength.

This fin fits standard longboard fin boxes.

Compatible with:

• Single fin longboards
• 2+1 longboards with center sliding box
• Mid-length boards with center sliding box

Not compatible with:

• FCS fin systems
• FCS II systems
• Futures fin systems

Works particularly well on:

Traditional longboards
Delivers excellent trim speed and classic glide.

Noserider longboards
The long rake increases hold while walking the board.

Performance longboards
Still allows smooth carving turns when placed slightly forward in the box.

Mid-length single fins
Provides drive and projection without feeling stiff.

Typical board sizes:

• 8'6" – 9'6" longboards
• 7'6" – 8'6" mid-lengths
• 2+1 longboards as a large center fin

If your longboard feels loose or lacks hold, a larger center surfboard fin like the 11" 4A immediately improves stability and trim.

Many surfers consider it the safest choice when you want dependable longboard performance without experimentation.

Specs

Fin Template: International 4A
Fin Height: 11"
Fin System: Standard center sliding fin box (US / Bahne box)
Construction: Pro Glass fiberglass
Colour: Blue / White / Red
Fin Type: Single center fin
Style: Classic raked longboard fin

Performance & Sizing

The 4A template is famous for its balanced combination of hold, trim and smooth turning control.

Key performance characteristics:

Long raked outline
Creates strong hold and drive when trimming.

Large surface area
Improves stability during noseriding.

Smooth drawn-out turns
Encourages flowing rail surfing rather than tight pivot turns.

Sizing logic for center surfboard fins:

• Smaller center fins = looser turning
• Larger center fins = more hold and trim stability

At 11 inches, this fin sits firmly in the maximum hold / classic trim category.

This fin is ideal for surfers who want

• Classic longboard trim speed
• Stable noseriding control
• Predictable hold in steeper waves
• Smooth flowing turns
• Reliable longboard performance

Best suited to:

• Traditional longboards
• Noserider designs
• Single-fin mid-lengths
• 2+1 longboards needing strong center hold

Choose 11" International 4A Center Surfboard Fin

Legendary template
The International 4A design has been trusted by longboard surfers for decades.

Maximum trim stability
Large raked outline holds the board steady while trimming.

Improved noseriding control
Extra surface area stabilises the tail while walking forward.

Strong Pro Glass construction
Durable fiberglass delivers consistent flex and long lifespan.

Classic longboard feel
Encourages smooth flowing surfing rather than twitchy turning.

Performance Comparison

Compared with other longboard surfboard fins:

Pivot fins (wide base, upright)
Provide tighter turning but less flowing trim.

Smaller centre fins (7"–9")
Feel looser but offer less hold.

Large raked fins like the 4A
Deliver maximum stability and classic trim speed.

If your goal is traditional longboard performance, the 4A remains one of the most reliable templates available.

Surfboard Fin Knowledge Hub

Choosing the right surfboard fins dramatically affects how a board feels in the water.

Delve deeper with these Eveley guides:

• Beginner’s Guide to Surfboard Fins – Types, Sizes & Setups Explained This beginner-friendly guide explains fin setups, sizes and materials so you can choose the right fins for stability and control.
• Longboard Fins Explained – Templates, Flex & Performance Complete guide to single fins, 2+1 configurations, fin placement, and performance tuning.
• Single Fin Surfing Guide This guide explains single fin surfing, fin sizing, templates and how to choose the right surfboard fins for longboards and mid-length boards.

Delve deeper: Sliding Center Fin Box (US / Bahne Box) Guide Understand fin installation, adjustment, and how fin position changes surfboard performance.

For the complete overview see:

Surfboard Fins Australia – Complete Buyer’s Guide

This pillar guide explains:

• fin types
• sizing logic
• fin systems
• materials and flex
• performance tuning

FAQs

Will this fin fit my longboard?
Yes, if your board has a standard US / International center fin box.

Is this good for noseriding?
Yes. The large raked template provides excellent tail stability when walking the board.

Can I use it in a 2+1 setup?
Yes. It works very well as the center fin in many 2+1 longboard setups.

Is Pro Glass strong?
Yes. Pro Glass fiberglass is durable and provides consistent flex under load.

Does fin size really change performance?
Absolutely. Larger center fins increase hold and trim stability, while smaller fins feel looser and turn more easily.