The Evolution Marine Shaft System (EMSS) is a complete shaft system from engine to propeller. It's comprised of two major components: 1) the "oil-lubricated section" containing a '22' allow stainless steel shaft enclosed in a 316L stainless steel shaft log tube with aft bearing housing and forward thrust bearing housing, and 2) the internal connecting shaft with a splined slip joint and flexible joints at each end.
Other system components include the engine adapter, mounting flanges, and monitor tank with its fittings and hoses.