Ullvén Mutes Trumpet Stubby Bop MuteUllvn Mutes Trumpet Stubby Bop Mute Introducing the Ullvn Stubby Bop Mute, designed by Swedish trumpeter Lasse Lindgren. This Harmon Style mute has a sound of its own that is perfect for jazz, blues, and pop music. Lindgren designed the mute to be a solo mute with a personal sound that is a little different from others. It produces a "Bluesy" character and is a little louder and more free blowing than other mutes. The Ullvn Stubby Bop Mute is perfect