Ernie Ball 6166 Mono Volume Pedal Item #: ERN 6166 

The Ernie Ball 6166 Volume Pedal features a potentiometer that has a 250k ohm resistance suitable for the audio path of passive instruments.
Behind the jack area under the footplate is a taper switch, which provides the user two distinct volume swell rates. The main pivot shaft is of centerless ground 1/2 inch diameter stainless steel, precision seated though nylon bushings at both ends. The large center shaft diameter, in addition the strength factor, creates a broader stress bearing surface.