Coppersmith extensive degree it must be annealed. This process involves heating the metal and then rapidly cooling it in water. The cooling stage is known as quenching. By heating the copper, the molecules in the metal are relaxed, and thus able to align themselves in a more uniform fashion. This allows for easier shaping of the metal. In order to keep this uniformity within the metal, it is cooled instantly. This prevents the molecules from moving around and causing tension in the structure of the metal. Unlike ferrous metals—which must be cooled slowly to anneal—copper can be cooled slowly in air
Glass marimba of mallets are used for different effects. The tuning system of a glass marimba can be whatever is desired. Glass marimbas are utilised by the Brazilian percussion ensemble, Uakti. Glass marimba can be constructed in a variety of ways. How one resonates the keys governs the construction method and design. Resonation can be accomplished using a single resonator which all the keys resonate into, such as an open top box, or individual resonators for each key which can be a tube, box, or sphere. Single box resonators can be constructed from wood, glass, or metal among a variety of materials.