The calabash is used as a resonator in many string instruments in India. Instruments that look like guitars are made of wood, but can have a calabash resonator at the end of the strings table, called "toomba". The "sitar", the "surbahar", the "tanpura" (north of India, "tambura" south of India), may have a "toomba". In some cases, the "toomba" may not be functional, but if the instrument is large, it is retained because of its balance function, which is the case of the "Saraswati veena". Other instruments like "rudra veena" and "vichitra veena" have two large calabash resonators at both ends of the strings table. The Baul singers of Bengal have musical instruments made out of calabash. The practice is also common among Buddhist and Jain sages.