My son uses this product for practicing on his trumpet. We first saw this on Youtube but thought it was a fluke. We did more research and after raving, reviews decided to buy it. My son loves this because we live in an apartment with neighbors next to us on both sides and below us. You cannot hear anything loud. I can read a book while he's playing using the silent brass and would not even know there was a trumpet being played. This is a must-have for brass playing musicians.
Van Nuys, CA