Agree with previous reviews. It is heavier than the all-rubber Ultra practice mute. I personally find the Artino metal/rubber model a little quieter. I tested both with a sound decibel app on my phones.....both are very, very close to same loudness. To my ear, the "muted" tone sounds better and more true with using the Artino mute than the all-rubber Ultra mute. I play the viola mainly, but also play a little bit on my violin and cello. The Artino cello fits my cello perfectly. The Artino violin mute fits the violin perfectly as well as fit violas up to about 14-15"). I play a 16" viola and this Artino model doesn't quite fit my viola bridge as well. Please be aware of this. It will work, but you have to position the teeth of the Artino mute so it's on the bridge and NOT touch and rubbing against the strings.....this is a little tricky on a 16-17" viola bridge that typically have bridges that are 46-50mm wide. The all-rubber Ultra viola-specific mute fits the viola perfectly. For violin/cellos, I give the Artino metal/rubber model 5-stars. But because you have to use the violin model on a larger viola, I would give it only 3-4 stars for violas only). I wish Artino would make a medium size mute for 16-17" violas. Also, unless you have full-size, adult-size instruments, you will have to purchase the all-rubber Ultra Practice Mutes for smaller violins and smaller cellos.