AR Drone 1.0 & 2.0 Upgrade SDT Bearings (8) SDT Bearings increase flight time, reduce weight, extend motor life, and make for a quieter flight SDT Bearings performed the best in a 2012 test of 9 different bearing brands SDT Bearings are used every week on the Youtube series "AR Drone Show w/ Kyle Tarpley" The bearings are compatible with Carbon Fiber Shafts - stock bushings are not Stock bushings are easy to upgrade to SDT Bearings using the Upgrade Tool Kit