Model: Designed Compatible with Model 3520, Compatible with a range of RC racing drones. Compatibility: Works with both CW and CCW motors Compatible with versatility in performance. Design: Features a 3-design Compatible with enhanced stability and improved aerodynamics during flight. Size: Compact 3.5-inch offers an ideal balance of thrust and maneuverability. Material: Made from PC material to resist wear and provide reliable flight characteristics. Application: Suitable Compatible with DIY drone builders looking to customize their remote control experience. Efficiency: Engineered to maximize efficiency, providing longer flight times Compatible with your racing drone.