Electro-Harmonix Op-Amp Big Muff Pi - Used

Used Electro-Harmonix Op-Amp Big Muff Pi in Excellent Condition A faithful reissue of the original classic circa 1978 Iconic sound and vibe that's coveted by guitarists Controls for Tone, Sustain and Volume, plus a Tone Bypass switch. True bypass switching for maximum signal integrity in bypass mode Rugged, compact, die-cast package - pedalboard friendly Dimensions in inches: 2.75 (w) x 4.5 (l) x 2.1 (h)