Bearing 30x55x13mm - using 6mm BBs
MetalTac Airsoft BBs .25g Perfect Grade High Precision 6mm BB Pellets
https://www.amazon.com/MetalTac-Airsoft-Perfect-Precision-Pellets/dp/B001BMOBD8/ref=lp_2596464011_1_4?srs=2596464011&ie=UTF8&qid=1524403817&sr=8-4
Fusion 360 file
https://a360.co/2K7rj81
3D printed Bipedal Humanoid Robot Project, Don't forget Subscribe to STG Robotics! https://www.youtube.com/c/richardramos
Thanks!
License:
Creative Commons - Attribution