1、Premium Material: All propeller blades are made of carbon fiber, a material that gives the blades a very high torsional stiffness. 2、Optimized Blade Profile: The blade profile is calculated by computer to make the blade thickness extremely thin, which reduces the power absorption of the motor and enables high efficiency operation. 3、Lightweight Design: Carbon fiber ultralight airplane propeller, designed for long lasting flight, increasing flight time and efficiency. 4、Dimensions: The length is 305mm, the adapter ring is 5mm, the small hole in the middle of the folding propellers is 6mm, and the large hole in the middle is 9mm. 5、Universal Installation Size: This 2 blades folding propeller is suitable for RC aircraft fixed wing, suitable for many brands of motors. Item Type: RC Plane Propellers Material: Carbon fiber, aluminum alloy Length: Approx. 305mm/12inAdapter Ring Inner Diameter: Approx. 5mm/0.2in Middle Small Hole Diameter: Approx. 6mm/0.24in Middle Big Hole Diameter: Approx. 9mm/0.35in Applicable: Fixed wing, suitable for various brands of motors 1 x RC Plane Propeller 1 x Adapter Ring