The BOSS SD-1-B50A is one of three iconic drive pedals reissued in exclusive metallic finishes and foiled packaging in celebration of BOSS 50th Anniversary. Since its release in 1981, the workhorse SD-1 Super Overdrive has been the core gain pedal for generations of players across every musical genre. The SD-1 delivers rich, smooth, and highly musical overdrive tones that continue to inspire guitarists everywhere.