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