Features:1.Each qualify checked item with a unique Manufacturing Part Number label on the inner package to confirm if it is the authentic item sold from our store.2.When you have any problems about your item, please send us the MPN label information first.3.Suitable for Remote Control Petrol Boat, Remote Control Speed Racing Boats4.Out Diamter: 67mm; Height: 25mm; Paddle Shaft Center Aperture: 6.35mm5.Made of Aluminum Alloy, 4 Blades with 1.7 Pitch PropSpecifications:Material:Aluminum AlloyColor: YellowModel: 6717Brand name: MxfansSize:6.7x2.5cm/2.64x1 inch(Out Diameter x Height)Shaft Center Aperture: 6.35mm (1/4 Shaft)Pitch: 1.7Weight: 38gPackage include:1 x RC Boat Propeller