( 2 Fin Set ) FCS Compatible, Flat Inside Foil: This is the original template for the CI twin fin dating back to the early 1980’s. It is a looser twin as compared to the Mark Richards style twin, and when hooked up with a small trailing center fin, makes a great loose feeling thruster. You will feel the speed of a twin-fin along with positive drive of a tri-fin.
HEIGHT: 5.62" / 143 mm
BASE: 5.0" / 127 mm
AREA: 20.47"² / 113.12 cm²