Identify the drone propellors.

The drone propellers have a different design on the tip, with one consisting of two silver strips, and the other with only one. Refer to the third image.

There is a bump on the propellor with the two silver stripes, located near the screw. This helps indicate the side of the the propeller goes on, as there is an indent on that side near the propeller motor on the drone. Refer to the first image.