An aluminum propeller is typically what comes standard on most sterndrive and outboard engines. An aluminum prop is a good all round prop that will provide good power on take off. It will also take the impact of an underwater object, which will damage the prop instead of damaging the internal components of the gear case. The Vortex XHS Prop is a high performance aluminum replacement Propeller. This propeller features a high performance blade geometry and a high gloss black powder coat finish.