19th century.
Thick-walled cup with a refreshing sound. An excellent instrument for training the focus and alertness. It could be used for any kind of practice. Equally good for beginners and experienced practitioners.
Frequencies: 579-585Hz (D5-5Hz). Monaural beats range Theta. 1676-1700Hz (G#6+15Hz). Monaural beats range Beta.
Other frequencies: 3186Hz, 4904Hz.
Includes complementary singing bowl cushion and striking/rubbing mallet R2.
