This is a mute for the Erhu. It allows you to lower the volume during practice in residential areas or at home at night without significantly compromising the Erhu's sound quality. Simply clip it onto the bridge for easy installation. Please note that it cannot be used with bridges that do not have a hole. The price is for one unit. As shown in image 3, we have multiple units available, so please specify the desired quantity. * Size: Approx. 3.8cm x 2.2cm x 1.8cm * Color: Matte gold or matte black