This package comes with the propellers wrench and screws for mounting replacement, props on and off e motors. Ive noticed no change in the sound or performance of these propellers. I ordered a set of off brand propellers and these propellers visually. I cant tell the difference. The main problem between the two were that the off brand screw holes were snug around the mounting screws, as opposed to these that were free floating. I dont know if this would affect the flying or not, but the enough is 600 to 800 and i really didnt want to guess at it. Yes, the off brand is two sets for propellers for ten dollars and the real and offi ones are twenty dollars for.

https://www.youtube.com/watch?v=jCxOHaUG5I8