4.5" Twin Keel Fins – Black Pro Glass FCS Compatible | Keel Fin Set (2 fins)

FCS compatible. Depth 4.5” Base 6.26” Foil: flat inner face.

The 4.5" Twin Keel Fin Set delivers traditional twin keel-fin drive, speed, and hold, inspired by classic fish and keel-based designs. With a wide base and upright keel outline, these fins generate strong acceleration and maintain momentum through flat sections while still allowing smooth, drawn-out turns.

Constructed from black Pro Glass fiberglass, the fins offer durability and a predictable flex pattern that complements the solid, drive-oriented nature of keel templates. Fully FCS compatible, this is a set of two fins designed for twin keel-fin and fish surfboards.

Key Features

• Classic twin keel fin template

• 4.5" depth with wide base for drive

• Black Pro Glass fiberglass construction

• Strong down-the-line speed and hold

• Smooth, flowing twin keel-fin feel

• FCS compatible

• Twin keel fin set (2 fins total)

Ideal For

• Twin keel-fin surfboards and fish shapes

• Retro and modern fish designs

• Surfers who prioritise speed and flow

• Small to medium waves with open faces

Why Choose Twin Keel Fins?

Keel fins are all about momentum. The wide base and upright profile create powerful drive and exceptional speed, making them ideal for fish boards and flatter rocker designs. These 4.5" Twin Keels provide that classic locked-in feel through turns while maintaining smooth rail-to-rail flow, especially in weaker or softer surf.

Fin Specifications

• Configuration: Twin Keel

• Fin Size: 4.5"

• Material: Pro Glass fiberglass

• Colour: Black

• Compatibility: FCS fin boxes

• Set: 2 fins

Will this fit my board?

Yes. This fin set fits FCS fin boxes commonly used on twin keel-fin surfboards, fish shapes, and retro designs.

What this fin does

If you ride a twin keel-fin or fish surfboard, this fin setup helps generate strong drive and speed, resulting in fast down-the-line surfing with smooth, flowing turns.

Best for

Best for surfers who want classic twin-fin speed and glide without the looseness of smaller or more upright twin templates.

How it compares

Compared to upright twin fins, these keel fins offer more base area and drive, making them a better choice for fish boards and surfers who value speed and momentum.

Local relevance

Designed to suit boards and conditions commonly surfed across Australian beach breaks and point waves.

FAQs

Will these fins fit my board?
Yes. They are designed for standard FCS fin boxes used on many twin-fin and fish surfboards.

Are keel fins good for small waves?
Yes. Keel fins excel in small to medium waves by generating speed through flatter sections.

Do keel fins feel stiff?
They provide strong hold and drive but still allow smooth, drawn-out turns rather than tight pivots.

Is Pro Glass suitable for everyday surfing?
Yes. Pro Glass fiberglass offers durability and a consistent flex for regular use.

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.

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