True Ames Greenough 4-A Longboard Fin - 10" Reactor O'Neill's ultimate seal system creates

O'Neill's ultimate seal system creates the perfect seal to eliminate water entry even on the biggest wipeouts

Performance shortboards and hybrid models with the FCS II Fin System

Fits 1-2 boards

raked fin to add performance and maneuverability to your log

True Ames Greenough 4-A Longboard Fin - 10" Reactor O'Neill's ultimate seal system createsThe Greenough 4 A fin works in just about anything! It has been the staple fin of True Ames for the best part of 40 years and is still the most popular single fin design out there A very well balanced fin, the full base and moderately flexible tip provides the perfect balance of drive off the bottom and a sharp responsiveness through arcing turns. Designed for both speed generation and spending time surfing in the pocket, the 4 A is a fin that will