The Son of Cobra Twin is designed with extra base angle to fit all Post-modern Twin fins with deep double concave bottom shape, especially the new ...Lost Cobra Killer and other Son of Cobra Round Twin. These fins have a 7.5 degree fin base angle (4 degrees is standard for twins)

Solid Fiberglass construction combined with a balanced base and height provides maximum drive, while the thinner tip offers release and spring off the top.