SHIFT SOUND & VIBRATION DAMPENINGUtilizes next generation hybrid hub technology by blending the best attributes of both traditional pressed-in hubs and newer drop-in hub technology. An all-in-one hub that includes shift shock and vibration dampening characteristics of a pressed-in hub along with the ease of use, replaceability, and reliability of drop-in designs. It has been engineered to not let loose and spin over time under normal use. Other competitive designs that claim shift and vibration dampening are less likely to break away, consequently turning into a solid hub once they exceed their maximum flex point, which increases the chances of lower unit damage under an impact. MasterTorq SDH has been designed to break away like Turning Point Propeller's industry leading MasterGuard® series of hubs. FOR ENGINES OVER 40HP AND ABOVE. See application chart for engine application information and hub part numbers. DIY, easily replaceable by handAdaptable to many engine brandsReliable over time, not likely to let loose & spin under normal useOffers more lower unit protection. Doesn't lock into a solid hub positionIncludes shift shock and vibration dampening rubber materialAdditional dampening through Hub Isolation Technology