Chrome - LP-Type Bridge and Saddle. Consisting of GT527 and GT810. Traditionally referred to as �tremolos� these units have, technically speaking, been misnamed for over 50 years. At GUITAR TECH, we prefer accuracy.Tremolo is amplitude modulation; Cyclical changes in perceived volume. The pitch change caused by the devices traditionally referred to as tremolos, is actually VIBRATO. Hence our use of the term