ZRE-DRONE 2 Sets HY Folding Propeller 6×4 7.5×4 8×4.5 8×6 11×6 With Spinner Cover Motor Shaft2.3/3.0/3.17/4.0mm RC Plane Glider Drones

For the great amount of propellers with varied types of different purposes, users should fly with them follow the instruction below for safety:
1.Please run your propeller with proper power system, and please do some necessary adjustment with test of static/ dynamic balance seriously, or you will easily have it damaged;
2.When the power system is working, please make sure that there is no one standing in front or on either side of it ( or its intake, if it is an electric ducted fan power system), preventing it from flying off unexpectedly and causing danger;
3.If there are some cracks or any structural damages on the propeller, please displace another one as soon as possible to prevent it from flying off into pieces and causing danger;
4.Before flying, please make sure the propeller is fixed well through the motor shaft and the two of which are in the same axis;
5. Please make sure the runway is clean, because such things like branches and little stones and easily cause danger and damage to people all around and the plane itself.