Save time, effort, and frustration when tuning your string instrument! Tune your cello in seconds! Excellent alternative for players young and older players having difficulty tuning instruments equipped with conventional wood pegs. Endorsed and used by clinicians, teachers, students and professionals alike, Perfection pegs utilize a revolutionary internal planetary gear design, to ensure players of all ages effortless, precise tuning without sticking or slipping pegs. Designed to look virtually identical to conventional wood pegs for aesthetic appeal, Perfection pegs also are easy to install, safe for the instrument, and need no servicing or maintenance. In addition, the 4:1 gear reduction enables the peg to function like a fine tuner, eliminating the need for fine tuners on the tailpiece - which improves instrument response. Available for violin, viola and cello. Professional installation required.