From the legendary riffs of Jimi Hendrix and George Clinton to the new-school licks of Slipknot and Korn, musicians have relied on Electro-Harmonix since the late '60s. Whether you crave the sustaining overdrive of the Big Muff Pi or the warm spring reverb of the Holy Grail, Electro-Harmonix has a stompbox with your name on it. Recently Electro-Harmonix has expanded its line of pedals to include new and exciting variations of their classic stompboxes. This is a power supply for the Metal Muff distortion pedal.