Future Keel Fins K1 Twin Keel (Classic/Keel) Height: 5.07 in-12.9 cm Base: 6.65 in-16.9 cm Area: 25.53 in-164.71 cm Retro Twin template based on classic 70's templates. Desinged with a break in the base to loosen up your ride. Available Materials: Fiber Glass Color available: (red, blue, clear, smoke) (smoke is pictured above)