Features: The 9450 propellers provide more thrust and power than older models, giving your quadcopter significantly higher lift and more power. Durable and easy to use. Higher tension, easy to install. The positive propellers are marked with 'L' on the blade and must be installed on the counter-clockwise rotating motor (the self-locking motor has a white head). The anti-propellers are marked with 'R' on the blade and must be installed on the clockwise rotating motor (the self-locking motor has a black head). Specifications: Material: ABS Model: 9450 Color: white, black (optional) Length: 9.4 inches / 24 cm Pitch: 5.0 mm Compatible with: for Phantom 2, Phantom 3(3A 3P) Note: Please allow 1-2 cm error due to manual measurement, make sure you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 2 pairs of 9450 propellers