The Shruti Box is an Indian Drone instrument that provides a steady tone for a myriad of uses including sound healing, meditation, and chanting. The single box is a (3) full chromatic scales for C2 to B4 in 440htz. A majority of the play will be on C-G interval which is the perfect fifth and is the most healing of musical intervals. This is a great tool for developing ones voice and is the best tool (aside from ones voice) for the throat chakra. Made of Teak Wood. Large Single Octave 16 x 2.75 x 12 Weight 12 Pounds