Futures EA Techflex Tri Surfboard Fins - Medium/GreyFutures EA Techflex Thruster Fin Set The EA Techflex, designed by Hawaiian shaper Eric Arakawa of Arakawa Designs, is a medium size thruster in the Rake template category. The Techflex construction and flat foil give this fin a stable feel, making it ideal for controlling speed in more powerful waves. Over 40 years of surfboard design won't do you wrong, trust Arakawa when the waves get interesting. Dimensions Side Fins: Height 4. 57 Base 4. 40 Area