The musical ensemble of the Main Jo oh consists of ajule (violin), banjeng (plucked bamboo zither), tungtung (bamboo-stamping tubes), tambo (double headed drum), and tawak (bronze-knobbed gong) . The banjeng and tungtung are bamboo instruments, indigenous to the Orang Asli. The jule is the Western violin and was brought to the peninsula by the Portuguese through Malacca. The violin among the Mah Meri was originally a gift from a visiting anthropologist in the late 1900s and was added to the ensemble. The tambo is believed to be of Malavu origin, and the gong was a peace-making gift between the Malayu and Mah Meri after the latter won a war (Chan 2010).

The really unique traditional instrument in the Orang Asli music is the Centong Buluh, a bamboo stamping tube that all Orang Asli including Mah Meri use.