The Dyna-Jet Cupped, which is a Michigan Wheel Federal Series ski boat propeller, is designed for high-power fast bottom boats. These propellers are made of a NiBrAl (Nickel, Bronze, Aluminum) alloy which provides extra strength, less flex, and greater durability. With this model, the trailing edges of the blades are cupped for extra speed. Cupping also adds camber, maximizing thrust, and minimizing vibration of a cavitating propeller.