Herbs go in the top, Spin the bulb handle on the side, and the typhoon grinding action will leave a pile of fluffy herbs beneath in the catch tray. Grinder pulls out of base easily for portability. Based on an idea I saw by Betathings / Opulence Mechanics Cyclonic Grinder a while back. The (5.95mm) bearing balls are a standard BB size. The rendering has a typo and will be updated shortly.