Mercury Black Max Propeller 13-14 x 17P RH 48-77344A45 Mercury Black Max Propellers are well-balanced aluminum props. These propellers are a great choice for engines less than 250 HP with top speeds less than 50 MPH80 KPH. Mercury Black Max propellers are made with Mercurys unique patented Mercalloy aluminum. This unique material allows Mercury props to have thinner blades that create less drag, resulting in optimal performance and durability. Features Easy to maintain and repair Good overall pe