Sonor Meisterklasse metallophone bars are 1 cm thick, with one hole in the bar. These bars are known for their resonance, they are overtone tuned to A440 (the industry standard). Diatonic units include F# and Bb bars, Chromatic Add-on units are available to finish out the chromatic scale. The Diatonic units also include a bar-holder on the side of the resonator box to hold the extra bars when not in use.
