Hustler (Registered Trademark) Aluminum Swept Cleaver 4 Blade Props for 40-150hp Engines with 4.25 in. Gearcases. 4 Blades That Re-wrote the Rules. The props that put the "4" in Performance. These props re-wrote the rules, proving that you can run a 4-Blade that has:-Unprecedented hole shot, lift, handling, ease of steering, and rough water stability.-No top-end speed loss you experience with other manufacturers 00 ft. s, and will outrun most newer props, including 5 blade ski props. Squeeze Cast for Added Strength: Stainless steel performance is built into the Hustler Aluminum prop line. This is achieved through unique blade geometry and an exclusive Turning Point manufacturing process, Squeeze Casting. This process generates the highest mechanical properties attainable in a cast aluminum prop resulting from high density tighter grain structure. Stiffer blades means less flex and a faster prop. Competitors good looks. This is the Gold Standard in Aluminum Corrosion Protection. Prop looks Newer Longer. Compared to Competitors Propeller Housings have massive Exhaust flow pathways. Their Propellers have 40% more Exhaust flow Area versus completive product. More Exhaust flow and less backpressure can generate more horsepower. Like headers for your boat. Material: Plastic.