10.5" International 4A Center Fin – Mid Yellow Pro Glass Longboard Single Fin | Sliding Center Fin Box Compatible

Depth 10.5” Base 7.7”

The 10.5" International 4A Center Fin is a classic longboard single fin designed for stability, hold, and controlled trim. With its upright template and extended depth, this fin excels in maintaining speed and direction on larger longboards, especially when noseriding or drawing long, committed lines.

Constructed from mid yellow Pro Glass fiberglass, the fin offers excellent strength with a predictable, supportive flex. The International 4A template is a long-established favourite among traditional longboarders, valued for its reliability and confidence in a wide range of conditions.

Compatible with standard sliding center fin boxes, this fin suits traditional logs, noseriders, and heavier boards where control and hold are priorities.

Key Features

• 10.5" International 4A longboard template

• Mid yellow Pro Glass fiberglass construction

• Upright outline for strong hold and stability

• Excellent trim control and directional drive

• Predictable flex for classic longboard feel

• Sliding center fin box compatible

• Sold as a single fin

Ideal For

• Traditional longboards, logs, and noseriders

• Larger boards and heavier surfers

• Single-fin setups requiring maximum hold

• Small to medium waves with clean faces

• Surfers focused on trim, nose time, and classic style

Why Choose the International 4A?

The International 4A is a proven, no-nonsense fin template that prioritises control and reliability. At 10.5", it provides added stability and confidence compared to smaller center fins, making it especially effective for noseriding and maintaining trim on bigger boards. The mid yellow Pro Glass colour delivers classic aesthetics with dependable performance.

Fin Specifications

• Size: 10.5"

• Configuration: Single / center fin

• Material: Pro Glass fiberglass

• Colour: Mid yellow

• Compatibility: Sliding center fin box (screw and plate included)

• Set: Single fin

Will this fit my board?

Yes. This fin fits standard sliding center fin boxes commonly used on Australian longboards, logs, and noseriders.

What this fin does

If you ride a traditional longboard or noserider, this fin helps increase hold and directional stability, resulting in smoother trim, more confidence on the nose, and cleaner drawn-out turns.

Best for

Best for surfers who want maximum stability and classic single-fin control without the looseness or reduced hold of smaller center fins.

How it compares

Compared to smaller center fins or modern click-in single fins, this fin offers greater hold and a more locked-in feel, making it a better choice for traditional noseriding and trim-focused longboarding.

Local relevance

Designed to suit boards and conditions commonly surfed on Sydney’s Northern Beaches and across Australian beach breaks and point waves.

FAQs

Will this fin fit my longboard?
Yes. It is designed for sliding center fin boxes commonly found on traditional longboards.

What size board is a 10.5" fin best for?
It works best in larger longboards, logs, and noseriders where stability and hold are priorities.

Is Pro Glass suitable for everyday surfing?
Yes. Pro Glass fiberglass is durable and offers a predictable flex ideal for regular use.

Does the colour affect performance?
No. The mid yellow colour is purely aesthetic and does not change how the fin performs.

We include

Free Delivery: Everywhere in Australia.

Tracking: Quick & easy online tracking on all fins. 

Peace of Mind: All our fins are insured against loss or damage in transit.

Prompt Australian Dispatch: All items are sent from stock held in Sydney on the same or next business day.

Returns: 30-day, no questions asked returns, for unused full price items.

No More to Pay: No surcharges added at the checkout.

Enjoy faster Express Shipping for just $10 per order at checkout.