The Boss 50th Anniversary Edition Super Overdrive Pedal is a special release of the legendary drive box. Containing the rich drive circuit that's loved by generations of guitarists, the Anniversary Edition comes cloaked in a shiny new metallic finish and anniversary branding - making sure it'll be a sought-after collector's item for many years to come. It's a genre-defining Boss overdrive sound, and it's no less potent in this anniversary special. A unique asymmetrical clipping circuit provides the tube-like response and dynamics that guitarists adore, making the SD-1 ideal for clean or slightly driven amps. Its mild-to-moderate drive character makes it great for pushing an amp into gritty distortion and injects your tone with a focused midrange and tightens up the low end. And just as ever, the SD-1 can serve as your base for additional boosts, drives, and distortions - or even used to bring definition to a high-gain amp! A must-have for fans, the 50th Anniversary Edition Super Overdrive is a celebration of sound.