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 cm² makes the propeller have an excellent reaction speed. This propeller is especially suitable for motors of class 2206, 2207, and 2306 with a Kv value of about 2400. 3. AVAN Flow propeller design starts from product design constraints such as RPM, air velocity, and required pull force. Based on these constraints, aerodynamic models are built, performance is simulated, and blade shapes are designed. 4. The highly curved blade provides a high lift coefficient when stalled at a high angle of attack delay, allowing the blade to remain efficient at higher blade angles. The curved propeller also enables a larger flight envelope, enabling excellent responsiveness at low throttle while reaching high speeds. 5. Made from special PC material for increased durability. After repeated comparison tests, the final PC material selected is surprisingly hard and flexible, with excellent drop resistance and flexural performance. The thickened blade root design further enhances the durability of the propeller. Optimized molding process minimizes bubble formation and increases the strength of the blade. Specifications: 1. Diameter: 5 inches 2. Pitch: 4.3 inches 3. Number of blades: 3 4. Moment of inertia: 13.4 g x cm² 5. Material: Plastic 6. Size: 7.7 x 2 cm 7. Color: Red/Black/Color Package Contents: 4 x Propeller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.