Features: 1Applicable Model: Boat motor propeller fit for 9.9?20HP outboard engines. Fit for 2?1/2in Gearcase Fit for CT/Bigfoot Model 9.9 2005?Newer Fit for 15/20 HP 4 Stroke 2007?Newer. 2Low Resistance: The aluminum alloy propeller blade has 3 sharp blades, and the blade profile is subject to almost zero resistance when propelling underwater, which can quickly cut the water surface and advance forward. 314 Spline Teeth: The propeller blades are connected by 14 spline teeth, forged with high?density pure copper, which better match the speed of the engine, so that your yacht can charge faster on the water. 4Seawater Resistance: The surface has been painted, which is smooth and clean, and resistant to salt. Even if it is immersed in seawater for a long time, the propeller blades will not be damaged. 5Excellent Performance: Designed based on OEM blade geometry, with appropriate cupping and camber added. Excellent bow lift, acceleration and top speed as well reducing slip, increasing bite. A cupped propeller will exhibit very high efficiency at high speeds as well as minimize cavitation under heavy loads. 6High Speed Applications: 9 1/4in diameter x 10in pitch, positive rake benefits from normal bow lift to permit the use of a larger diameter propeller, while negative rake can provide extra blade strength for use in very high speed applications. Package included: 1 x Outboard Propeller&nbsp