370908 Using the 3K pure carbon fiber woven cloth， by high temperature high pressure precast precision machining， hardness is higher than that of conventional products market， each pair of all carbon fiber and propeller were treated by artificial balancing static and dynamic equilibrium Description: Item No:UL38300X2 Item name: 5045 carbon fiber propeller Pitch: 4.5 Main hole diameter: 5mm Quantity: 2 pairs (2xCW， 2xCCW) Usage: for 230 250 300 Quadcopter Package included: 2 x CW propeller 2 x CCW propeller