This is an older model of the Heifetz mute. The old model was discontinued about 25 years ago and was very popular at the time. It is still quite difficult to obtain among enthusiasts. It took me over 5 years to find one myself! I have a few in stock, so I'm listing them for sale. The official Heifetz website also sells them at a high price. https://www.theheifetzmute.com Please refer to it. #violin #violin #violinmute #violinmute #heifetzmute