9" International 4A Center Fin, black on natural Pro Glass with inlaid carbon fiber.

Depth: 9” Base: 6.7”

The 4A is iconic and revered in the world of fin shapes, offering ample base for drive and a tapered tip for dynamic maneuverability.

This robust fiberglass fin comes complete with the screw and plate for secure installation.

Here’s some great things about the International 4A fin:

✅ 1. Classic and Timeless Design

• Originally designed by George Greenough, the 4A has been a staple for decades.

• Its template blends performance and smooth flow, making it ideal for traditional longboarding.

✅ 2. Great for Turns and Flow

• The swept-back rake offers smooth, arcing turns.

• It provides predictable, fluid rail-to-rail transitions, perfect for trim and carving.

✅ 3. Balanced Flex

• The International 4A has a moderate flex, which helps generate speed out of turns.

• Offers some spring without being too loose or floppy.

✅ 4. Versatile Performance

• Works well in a wide range of conditions – from small, peeling waves to shoulder-high surf.

• Can be used in logs, performance longboards, or even mid-lengths depending on the size.

✅ 6. Widely Loved

• Highly recommended by surfers across generations.

✅ 7. Ideal for Both Nose Riding and Carving

• Offers a good middle ground — enough hold for noserides but loose enough for stylish turns.

• Not overly stiff like pivot fins, nor overly loose like flex fins.