Magnesium Propeller Anodes

There are so many different types of marine propellers out there, from Auto Prop, Radice, and Beneteau to Gori, Max Prop and Flex-O-Fold props how can you be sure you are protecting your boat propeller shaft and blades from corrosion? We have zinc, for saltwater boating, aluminum for salt and brackish water boating, and magnesium for freshwater boating for the most popular (and the obscure) propellers that make your boat go where you point it.