Variable Resistance Mouthpiece Buzzing Tool

This is my take on the variable resistance mouthpiece buzzing tool.  A simple rotating barrel scheme is used to select between 4 aperture sizes, 9mm (fully open), 7mm, 5mm, and 3mm, allowing the user to select a desired resistance profile for mouthpiece buzzing practice.  The tool also slightly dampens the buzzing sound, more so with the smaller apertures.  

Available for trumpet shank.  Cornet, horn, trombone versions coming soon.