True Ames KC Tri Thruster Fins

True Ames KC Tri Fin Set is a solid fiberglass thruster fin configuration crafted for balanced power, smooth control, and mid‑weight surfers. Each fin measures 4.67 in (119 mm) in height, with a 4.56 in (116 mm) base and a surface area of 15.71 in² (101.35 cm²). The template delivers responsive tip flex and stability through cutbacks and arcing turns, making it ideal for everyday shortboards, step‑ups, and even gun boards. Built from solid fiberglass, these fins offer durability and consistent flex characteristics under load.