An Electro-Harmonix Ram's Head Big Muff Pi, in excellent condition! Very light signs of wear, but functions as-new.

From the Manufacturer:

Electro-Harmonix has unveiled a faithful re-creation of their original 1973 Violet Ram's Head Big Muff renowned for its exceptional sustain and articulate string separation. The new pedal is housed in a pedalboard friendly die-cast chassis and equipped with a few select updates for convenience. These include true bypass switching, an LED to indicate effect status and the option of being powered by a 9-volt AC adapter.

The Ram's Head Big Muff features Volume, Tone and Sustain control with an extremely wide range of tonal capability that transforms your guitar's sound. Great string definition makes this pedal ideal for fast guitar leads and solos that won't blur or fade. At high settings, it offers complex 'sonic mayhem' feedback, perfect for hard rock and heavy metal.

Features
• The authentic V2 Violet Ram's Head Big Muff in a nano-sized chassis
• Incredible string separation and sustain
• High settings offer 'sonic mayhem' distortion
• Ideal for fast leads, hard rock and heavy metal
• Effect status LED
• True bypass
• Vintage look and graphics
• 9V battery included, also accepts optional EHX 9.6VDC-200mA power supply