Selftightening replacement propellers designed for fast, reliable thrust and stable flight performance. These 9450S twoblade props offer quick mounting and releasing, strong lift, and precise balance for consistent behavior during normal and demanding flights. Key benefits Quick installation and release for fast field replacement. Selftightening design reduces loosening in flight, improving reliability. Fast, powerful thrust while maintaining well balanced rotation for smooth control. Each set includes both clockwise and counterclockwise propellers to match motor orientation. Super balanced construction for steady performance and reduced vibration. Compatibility and fit Size: 9450S Shaft hole diameter: 3 mm Blade thickness: 15 mm Vane quantity: 2 Color: White Material: Plastic Compatible with Phantom 4 Pro Obsidian style RC quadcopters and similar models that use 9450S props with a 3 mm shaft. Package contents 2 x clockwise propeller 2 x counterclockwise propeller Note: Accessories only. Package does not contain any aircraft model. Important note before Please carefully check the rotating diameter and pitch of your product to ensure compatibility with your RC plane motor and airframe. Practical use scenarios Onfield spare set for quick propeller replacement after transport or minor damage. Preflight maintenance to swap older or unbalanced props and restore smooth handling. Flight testing and tuning when experimenting with prop combinations to optimize performance. These props are a direct replacement option matching the 9450S specification and intended for standard hobby and enthusiast RC quadcopter use.