Slight dent {it will get more dents with time, so...)
Slide won't stay in place and supplier said to use slide wax to hold it in place which affects the sound when tube extended or out
Apparently this is common which amounts to shoddy workmanship

A quality mute for a good price that sounds great and plays in tune. Nicely made and comfortable to hold and use and the stem move freely for quick manoeuvres!