The Futures AM1 Techflex Thruster Fin Set eatures a wider base and refined tip, for the perfect mix of drive and release.The AM1 Techflex, designed by Al Merrick of Channel Island Surfboards, is a medium size Speed Control fin with a Ride Number of 4.0. The template features a wider base and refined tip, for the perfect mix of drive and release. The Techflex construction and flat foil give this fin a stable feel, making it ideal for controlling speed in more powerful waves.