Surfers, if you're looking to upgrade your board's performance, these FCS II Harley Cool Grey quad fins are worth checking out! Designed by Harley Ingleby, these fins are specifically set up for quad configuration, giving you that perfect blend of speed, hold, and maneuverability. The cool grey color looks sleek on any board, and since they're the retail version, you're getting the genuine FCS product with all the quality that brand is known for. FCS II means they use the tab connection system that makes installation and removal super quick and secure - no tools needed once the plugs are in your board. Quad setups are great for generating speed down the line while maintaining solid control in critical sections. Whether you're riding smaller waves and want more drive or charging bigger surf and need responsive control, these fins deliver that professional performance level. The design really shines in generating speed through flat sections while still giving you the hold you need when the wave gets steep. If you're tired of your current fin setup or just want to experiment with different configurations, these Harley quads might be exactly what your surfing needs!