HarmonTrombone Mute (J3)

It is a great idea, but I can't help but think that Harmon didn't try very hard with it. There are some significant flaws that could easily have been fixed; I would expect more from a great mute company like Harmon. I would only recommend it if you are on a budget. The straight mute works fine, and as far as I can tell it sounds fine, though I've only played trombone a few years and do not have a large amount of experience with mutes. The plunger mute sounds fine too, as long as you do not let it touch the bell while playing. Then it makes this awful metal-on-metal vibrating sound. I have no idea why they did not put some rubber along the edge. The worst part though is the combined cup mute. To make it, you just shove the straight and plunger mutes together and it feels like it won't hold together after a lot of use. But what is worse is that the plunger is too long when they fit together so the quark board on the straight mute does not hold inside the bell. You have too hold it yourself, and it is not an ideal situation. If they ever have a version 2.0, I would likely recommend it fullheartedly, but as it stands, only buy this if you cannot afford three separate.

its too small for a tenor trombone

I bought it to fit into a Holton trombone. I did not fit. I'm pretty sure it was meant for a smaller model trombone but the description didn't specify.