Dji 9450 Thrust Boosted Self Tightening Props for Dji Phantom 2, Phantom 2 Vision, Vision+, Flamewheel 450/550 New! Upgraded DJI Self-tightening Propeller Set 9450 Include 1 CW and 1 CCW 9" Self-Tightening Propeller Designed for DJI Phantom 2, Phantom 2 Vision, Vision+, Flamewheel 450 or 550 with E300 series motors Impoved design to increase extra 100g lift force more than original 9443 props Achieve about 2 minutes extra flying time