Same size with the original one, easy installation
Remove the propeller and main gear firstly, and then use this new sealed gearing to replace the old one, try to install slightly and carefully.
This ball bearing set is a direct replacement for the Ar Drone. The Ar Drone comes with 8 brass bushings (2 on each gear shaft). By replacing your bushings with this bearing set you will increase battery time and brush-less motor life ( X 4). This conversion will allow your Drone to operate more efficiently. Conversion is very simple and takes around 5 minutes to complete.