Offering a stiff carbon base paired with a fine-tuned tip, the Tech 2 series shines best in clean, powerful waves where the need for a reliable, stable feeling makes the difference between an amazing ride and an epic fail. Allowing for ultimate control, CI fins offer a predictable and consistent feel underfoot while fulfilling the high demand for the drive and release needed in professional level surfing. The legendary Al Merrick fin template by Channel Islands Surfboards. 4.50" (medium) fin size, designed with riders 165lbs and under in mind. Thruster fin set. These fins excel in waves with more power.