The Tourte waisted violin mute or ‘violin-shaped’ violin mute works on the same principle as the Tourte round violin mute, except that it only goes over one string, not two.
The mute stays on the instrument when not in use and then easily slipped on to the bridge when required. When engaged, the mute sits across either the D or A string, muting the bridge. The rubber of the mute is secure to use on your violin and will not damage the instrument or the strings in any way. It has a small pin on the top which makes it easier to move and slide.
Some players prefer the Tourte waisted or violin-shape mute to the round one giving the reason that it is more secure when not in use.