a stringed musical instrument comprises of a headstock with tuners , a neck having a fretboard , a body having a top and back , a saddle with a bridge secured to the body and one or more strings stretched from the headstock over the neck , fretboard , and over a portion of the top of the body to contact points on the bridge saddle . the instrument is further provided with a means for adjusting the saddles up or down in any interval to change individual string action height while the saddles maintain full contact to the body of the instrument without the employment of inferior air gaps between the bottom of the string and the instrument &# 39 ; s body . the elimination of air gaps under the instrument &# 39 ; s saddle or bridge offer improved sonic sustain and enhanced musical tone .