Open-gear bass tuner pegs included in the package - A reliable replacement for most bass and guitar tuners - Compatible with left- and right-handed players - 4 strings use a metal nickel-plated alloy; automatic winding; delivers a brighter tone, higher volume, and greater tonal intensity - Designed for 4-string basses; precise, responsive, smooth gears with secure tuning and improved stability - Easy installation; string spacing about 19 mm; fits 4-string Precision Bass or other electric basses Use scenarios - Replacing worn or slipping tuners on a 4-string bass to restore accurate tuning and reliable performance on stage or in the studio - Upgrading a Precision Bass or other 4-string electric bass to achieve finer intonation, quicker tuning response, and improved overall tone - Setting up for left-handed players, with compatibility for both left- and right-handed configurations to suit individual playing preferences