This is the Arri MFF-2 Mini Follow Focus Base does not include a knob or gears. A variety of knobs and gears are available for this base, please see below. Complete kits are also available that include knobs and gears.
Prop65 WARNING: This product may expose you to chemicals which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.