4.5" Responder Thruster Fins – Black on Yellow-Green Pro Glass | FCS II Compatible (Set of 3)

FCSII compatible. Side fins Depth 4.5" Base 4.41" Center fin Depth 4.41” Base 4.33” Foil flat inside face on side fins, 50/50 on center fin.

The 4.5" Responder Thruster Fins are built for surfers who want tight turns, fast response, and explosive release. Featuring the Responder template and constructed in black on yellow-green Pro Glass, this fin set delivers a lively, predictable feel with eye-catching contrast.

The compact 4.5" thruster size favours quick direction changes and strong pivot off the tail, making these fins ideal for performance shortboards and responsive hybrids. Pro Glass fiberglass provides durability and a smooth, controlled flex pattern that holds under pressure while rebounding cleanly out of turns.

Fully FCS II compatible, these fins install tool-free and lock securely into your board—perfect for everyday performance surfing in beach breaks, points, and punchy conditions.

Key Features

• Thruster (3-fin) configuration for balanced performance

• 4.5" Responder template for tight arcs and quick release

• Black on yellow-green Pro Glass construction for strength and visual pop

• Predictable fiberglass flex with smooth rebound

• FCS II compatible – tool-free installation

• Ideal for performance shortboards and lively hybrids

Performance Benefits

• Fast acceleration with low drag

• Sharp, controlled turns and quick pivot

• Reliable hold through critical sections

• Responsive feel without harsh stiffness

Recommended Conditions

• Waist-high to overhead surf

• Beach breaks, points, and reefs

• Clean to punchy waves where speed and response matter

Fin Specifications

• Configuration: Thruster (3 fins)

• Fin Height: 4.5"

• Template: Responder

• Construction: Pro Glass (black on yellow-green)

• System: FCS II compatible

• Set Includes: 3 fins

Highlights

• 4.5" Responder Thruster Template
  Designed for tight arcs, fast pivot, and quick release.

• Responsive Performance Feel
  Ideal for surfers who want rapid direction changes and explosive turns.

• Pro Glass Fiberglass Construction
  Durable build with a smooth, predictable flex pattern.

• Black on Yellow-Green
  High-contrast colourway for visibility and standout style.

• FCS II Compatible
  Tool-free installation with a secure, locked-in fit.

• Performance Shortboard Focus
  Suits modern shortboards and responsive hybrid shapes.

FAQs

What does the Responder template do?
This Responder template emphasises quick pivot and fast release, ideal for tight, performance-oriented turns.

Is Pro Glass suitable for everyday surfing?
Yes. Pro Glass offers excellent durability with a smooth, predictable flex that works well in daily conditions.

Do these fins require screws?
No. These fins are FCS II compatible and install securely without tools.

These fins are considered a medium size thruster set.

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.

Faster Express Shipping just $10 per order at the checkout.