eFuture(TM) 1 Set 8Pcs packaged Parrot AR Drone Quadcopter 2.0 & 1st Upgrade Drive Gear Bearings +eFuture's nice Keyring 100% Brand new and high quality 8 Brass bushings (2 on each gear shaft) By replacing your bushings with this bearing set you will increase battery time and brushless motor life Conversion is very simple and takes around 5 minutes to complete