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These are orchestral mutes, meant for scores that call for the effect. For that purpose they work fine, are easy to put on and position along the string, and they don't obstruct your view of the contact point.
But that's not what I wanted - I wanted serious volume reduction for nighttime practice. I found it in the Artino Practice Mute for violin/viola. It's a full bridge mute that's massive, with a rubberized metal body that can be placed at varying depths over the bridge to refine the resulting muted sound quality. Yes it obscures your view of the contact point but, once you get used to it, it's the most effective volume-reduction mute for a violin I've come across - aside from covering up the F-holes, which is a nasty thing to do to your instrument.