XOAR PJA 17x8 RC Airplane Propeller. 17 Inch 2 Blade Wood Prop for Gas Engines PREMIUM MATERIAL: Made of Premium Top Grade German Pollmeier Beechwood Lumber. It is excellent for minimal elongation, breakpoint and distortion, therefore it is the best for making Wooden Model Airplane Propellers. CNC DIGITAL IMAGING: CNC digital imaging process ensures consistent quality in diameter, propeller blade profile and pitch which are all crucial for RC aircraft performance. PRE-BALANCED* : Each Xoar prop is manually finished to reach perfect surface smoothness. It is balanced both horizontally and vertically for minimal vibration caused by airplane propeller. SPEC: Diameter: 17 in | Pitch: 8 | Weight: 59g | Shaft Diameter: 8mm | Type: Tractor Propeller COMPATIBLE ENGINES: 30cc to 40cc Gasoline Engines for RC Model Airplanes.