Input (grade 12): The Chinese yazheng and yaqin, and Korean ajaeng zithers are generally played by "bowing" with a rosined stick, which creates friction against the strings without any horsehair.
Output (grade 10): The Chinese yazheng and yaqin, and Korean ajaeng zithers are generally played by "bowing" with a rosined stick, which rubs against the strings without any horsehair.