Gotoh Mini 510 Gold Tuners (3 per side) SGS is the smaller model of SG510 series and use a 18:1 gear ratio The SGS510 series has evolved through improvement without compromise at any stage and come equipped with a considerable application of high-technology as standard With the improvement of precision fitting gears, marvelous touch on playingthey have gained a considerable reputation and are trusted as the No.1 machine head by many musicians all over the world Mounting hardware included.