The potentiometer has a 250k ohm resistance suitable for the audio path of passive instruments. Behind the jack area under the footplate is a micro taper switch which provides the user two distinct volume swell rates. Overall Volume Pedal Junior dimensions: 3.5'' W x 10'' L x2 3/8'' H . The main pivot shaft is of centerless ground 1/2 diameter stainless steel, precision seated though nylon bushings at both ends. Tough long lasting Kevlar cable transmits pedal travel to the controls and is attached by stainless steel springs.