Fangrui Product Details Features: 1. Avan Flow Propellers Are Designed To Maximize Control Performance While Remaining Efficient. The 4.3-inch Pitch That Continues From The Base Of The Propeller To The Tip Provides Linear Control Over The Entire Throttle Range While Reaching High Speeds. It Is Made Of Special Pc Material And Weighs Only 4.3g. 2. Most Of The Weight Is Concentrated Around The Hub Of The Propeller, And The Low Moment Of Inertia Of 13.4 G X Cm^2 Makes The Propeller Have An Excellent Reaction Speed. This Propeller Is Especially Suitable For Motors Of Class 2206-2207-2306 With Kv Value Of About 2400. 3. Avan Flow Propeller Design Starts From Product Design Constraints Such As Rpm, Air Velocity, Required Pull Force. Based On These Constraints, Aerodynamic Models Are Built, Performance Is Simulated, And Paddle Shapes Are Designed. 4. The Highly Curved Paddle Provides A High Lift Coefficient When Stalled At A High Angle Of Attack Delay, Allowing The Paddle To Remain Efficient At Higher Blade Angles. The Curved Propeller Easy To Clean And Maintain