Bronze alloys in gamelan instruments can very dramatically between various gamelan makers. Of the makers that use Copper Tin alloys, high tin (greater than 17% by weight) are preferred. Typically the traditional alloys used vary between 20-24% tin by weight. ¹⁾ Also the material properties of 20% by weight tin is considered to be the prime material to use. According to Nyoman Wenten the alloy used to make gamelan instruments is varied by the size of the instrument, as a stronger alloy is needed for larger gongs than is needed for smaller bars and kettles, and this variation of recipes is necessary to make instruments that sound perfectly balanced.

A mixture of 30 parts copper to 10 parts tin ²⁾
According to Nyoman Wenten 30 parts copper to 11 parts tin