have heart alt thruster fin

Our Alt Range uses composite materials. That's just a fancy term for saying we use two different types of material in the fin construction that delivers, what we call a Carbon Flex combination. You'll find carbon at the base of the fin (the stiffness at the base helps with drive and control) and a honeycomb fabrication for the rest of the fin (giving the fin the ability to flex above the stiff base). This is a great all-round construction option offering drive and whip at the right times.