The Ultra USA muter is a good product, since I tested my teachers' piece and was very sattisfied with it. Unfortunately, Thomann shipped another muter than the one displayed on the site, which is of a poor quality: a flaccid rubber piece that misses the ULTRA USA inscriptions on the back as displayed on the website. It has hardly any mute-capacity, so I had to send it back. This has been a dissapointing experience.