Profile: Piranha Propellers offers propeller center hub, which uses a high grade 6061 T6 extruded aluminum core encapsulated in the same composite material as the boat propeller blades. Our composite propeller technology is used by piranha, which allows for novel design with features such as replaceable blades and a design unmatched for corrosion resistance. Our product includes evinrude propellers, force propellers, johnson propellers, mariner propellers and mercruiser propellers.