The Native Watercraft Propel Easy Cruz Propeller is a replacement high efficiency propeller. It optimizes pitch and rake adjustments to give the propel drive unit a 50% increase in efficiency while maintaining the same top end speed the Propel Drive is revered for. Native has also added a power boat like shear pin system to protect your drive system in case the blades strike anything while spinning. This is just the replacement propeller and shear pins. Full upgrade kit sold separately.