GoolRC 5 Pairs Nylon 10x4.5" 1045 1045R CW CCW Propeller Black for DJI F450 500 F550 FPV Multi-Copter QuadCopter APC-Black 5 Pairs Carbon Nylon 10x4.5 High quality and durable in use, Easy to install 100% Brand New Material:Carbon Nylon Thickness of center: 9.7mm