They are motors. They spin (very well). Good replacements.
Reviewed by: Daniel Delaney from Colorado on 11/23/2016
I burned out one of my motors when I failed to disarm in tall grass. These arrived quickly, and a little soldering (the wires are exactly the right length) put me right back in the air.
Reviewed by: (Verified Buyer) Charles Hatfield from Erie, PA on 10/22/2017