It's one type of electric propeller. Contra Rotation series, the propeller includes two parts(front propeller and rear propeller). Different design of front and rear propellers to play the best matching effect.

Its rigorously designed blade airfoil combines power, braking and optimal low noise performance. 

Features:

Light weight

High efficiency

Low noise 

Pre-balanced

Tested and Inspected

Multiple colours can be customized.