Seaside model Quad Keels With small wave performance surfing in mind, this set features an upright, pivot-style template with flat front and rear foils, allowing for a very tight turning radius. Riders will notice quick response from the fins, and the perfect combination of speed and control. Solid Glass Front Foil: Flat Height: 4.79" Base: 4.76" Rake: 37.82 deg Area: 20.75 deg Rear Foil: 50/50 Symetrical Foil Height: 3.11" Base: 3.50" Rake: 35.65 deg Area: 10.14 deg