b' Features: Carbon fiber 1045 10 * 4.5 CW CCW propellers prop for F450 500 550 RC quadCopter multiCopter. These propellers are extremely lightweight and durable. You can expect an increase in overall motor efficiency owing to the ultra thin and stiff carbon construction. Lightweight and durable Great balancing and superb hub centering Suit for F450 500 F550 RC QuadCopter MultiCopter This propeller p is supplied with shaft adapters to ensure accurate centering Specifications: Material: Carbon fiber Color: Black Length: 10inch Pitch: 4.5inch Hub ID dia: 8mm Hub OD dia: 13mm Shaft adapters diameter: 5mm and 6mm Rotation: clockwise and counterclockwise Notes: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Included: 1 x1045 CW Propeller 1x1045 CCW Propeller 1xShaft Adapter'