9" International 4A Center Fin – Black on Natural Pro Glass with Inlaid Carbon Fiber

Depth: 9” Base: 6.7”

The 9" International 4A Center Fin in black on natural Pro Glass with inlaid carbon fiber is a traditional raked single-fin template designed for balanced trim, drawn-out turns, and consistent hold across a wide range of longboard shapes.

Constructed from layered Pro Glass fiberglass with an integrated carbon fiber inlay, this fin increases longitudinal stiffness without altering the proven 4A outline. The result is predictable flex control, stable projection through turns, and reliable tracking while trimming or noseriding.

The black over natural layup provides clear visual contrast that reveals the fiberglass structure and carbon reinforcement, while maintaining a neutral, functional appearance suited to classic and modern longboards.

Key features

• 9" International 4A raked single-fin template

• Pro Glass fiberglass construction for strength and controlled flex

• Inlaid carbon fiber to increase stiffness and projection

• Balanced hold for trim, carving turns, and noseriding stability

• Black on natural layered finish showing structural materials

• Standard screw and plate mounting hardware included

Ideal for

• Traditional single-fin longboards

• Noseriders requiring dependable tail hold

• Mid-length boards using larger center fins

• Surfers seeking smooth, drawn-out turning response

• Beach breaks and point waves with varied power

Why choose this product

This fin retains the trusted International 4A geometry while adding carbon reinforcement to stabilise flex under load. The construction improves projection and consistency without changing the familiar feel of a classic raked longboard fin.

It is suited to surfers who want traditional control with subtle performance refinement rather than a radically stiff or highly flexible template.

Compatibility

Designed to fit standard sliding center fin box systems using screw and plate attachment.

Frequently Asked Questions

Does the carbon fiber make the fin too stiff?
No. The carbon inlay increases longitudinal stability while the surrounding Pro Glass maintains controlled, predictable flex.

What board size works best with a 9" 4A fin?
Typically longboards from approximately 9'0" upward, depending on tail width, rocker, and intended riding style.

Can this fin be used in a 2+1 setup?
Yes. It can function as the center fin in a 2+1 configuration when matched with compatible side bites.

Is mounting hardware included?
Yes. A standard screw and plate are supplied for sliding center fin box installation.

Summary

9" International 4A longboard center fin made from black on natural Pro Glass with inlaid carbon fiber reinforcement. Designed for sliding center fin box compatibility, this raked single-fin template provides balanced hold, smooth trim, controlled projection, and reliable noseriding stability for traditional and performance longboards.

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 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.

Express Shipping just $10 per order at checkout.