This amazing compact mute for trumpet is even quieter than popular Warm-up trumpet.
Its quality as warm-up mute is same as Warm-up trumpet or even better actually.
Some people prefer Warm-up, and some prefer e-Brass Jr.
This mute did not offer the low volume that I need for my situation. My 20 year old BB aluminum mute is much softer. The warm up jr. sounds like a straight mute but not much softer. It does slot pretty well and it's light weight. I will be exchanging it for the aluminum BB mute.
This mute is very well made as all Best Brass mutes are. This mute works as well at dampening the sound as its big brother/sister, the Best Brass Warm-Up mute. The difference between the two is the size and a slight difference in the sound characteristics, but both are excellent, play well and in tune. I use both of them and switch between them for a little variety.