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Express® Mach3 Stainless Steel 3 Blade Props for 9.9-35hp Engines with 3" GearcasesStronger materials, more corrosion resistance, higher gloss and new casting technologyIncludes Turning Point's cutting-edge designsState-of-the-art casting technologies and race-proven finish and tuning practices to the Express line of propsProprietary stainless steel, TP17™Performance tuned pitch & rake anglesUses 20 series Installation/hub kits only-Sold separatelySee application chart for engine application information and required Installation/hub kit part numbers Why upgrade to a Tuning Point stainless steel propeller?- Stainless steel propellers are much more durable compared to aluminum.- Substantial better performance over competitive aluminum propellers. (Minimal performance difference, around 0.5-1mph speed gain over Turning Point Aluminum Propeller Designs.)- Expect better performance over competitive OEM and Aftermarket Stainless Steel propellers.The 3-Blade Express is great for boaters looking to get the most top end out of their boat, and offer excellent bow lifting capabilities.Proprietary Stainless Steel, TP17™:Formulated to meet the exacting requirements of the New Express Mach3 and Mach4 designs. 20% higher chromium content than the competition - more shine, better corrosion resistance. Almost 250% Stronger and 5X more durable than run-of-the-mill stainless steel. This new material allows Turning Point's Engineers and Designers the freedom to produce radical new designs that will help you wring the most performance out of your boat.Large Free Flowing Exhaust Ports:Turning Point's Propeller Housings have massive Exhaust flow pathways. Their Propellers have 40% more exhaust flow Area versus competive product. More exhaust flow and less backpressure can generate more horsepower. Like headers for your boat.