RC fixedwing airplane propellers, 2blade replacement set designed for electric model aircraft and hobby planes. Key features Package contents: 4 pieces of fixedwing airplane propellers. Blade count: 2 vanes per propeller. Available styles: 6x4 inch and 9x6 inch. Propeller diameter: 6 inch and 9 inch. Height: 5.9 mm and 12 mm. Propeller washer sizes (as supplied): For 6x4: 3.9 / 2.8 / 5.9 / 4.8 mm and 5.7 / 4.8 / 2.9 / 4.8 mm. For 9x6: 7.7 / 5.7 / 4.8 / 2.8 / 3 / 3.8 mm and 3.7 / 4.8 / 5.8 / 2.8 mm. Why choose these propellers Compatibility and options: Two common pitch and diameter options (6x4 and 9x6) help match prop size to motor and airframe requirements. Multiple washer sizes are provided to fit a range of shafts and hubs. Lightweight material: Molded plastic construction lowers rotating mass for improved motor response and reduced load on the drivetrain. Easy to balance and install: Simple geometry makes trimming and balancing straightforward, which helps reduce vibration and improve flight smoothness. General purpose performance: Suitable for routine flying and practice on electric trainer and sport models. Usage notes Verify rotating diameter and pitch compatibility with your motor and airframe before ordering. Use the appropriate washer combination for secure mounting and proper shaft spacing. Balance each propeller after installation for results. Typical applications Replacing damaged or worn props on electric trainer aircraft. Swapping propellers to test different thrust and efficiency combinations on hobby sport models. Using as spare propellers during flight practice, club flying, or field repairs. This product provides simple, reliable replacement propellers for fixedwing electric model aircraft where common sizes, easy balancing, and lightweight construction are required.