Makes the Soprano Metallophone into a chromatic instrument. Meisterklasse are the best instruments crafted by Sonor. Built entirely in the company's German factory. Only the finest materials and techniques are employed in creating these sonically and physically superior instruments. Meisterklasse metallophone bars consist of a special light alloy and are 1 cm thick with one hole at the top. They are precisely and harmonically fine-tuned to A-440 standard. By using the highest-quality bar material available, they produce a consistent and long-sustaining sound.