Jo-Ral Grime Gutter Mouthpiece Pouches Cornet/French Horn Jo-Ral Grime Gutter mouthpiece pouches designed to protect your mouthpiece Molded plastic Available for Trumpet, Cornet, French Horn, Trombone and Tuba The Jo-Ral Grime Gutter Mouthpiece Pouches feature a molded rubber design to offer protection without marring the finish of the mouthpiece Manufactured with affordability in mind, these Grime Gutter Mouthpiece Pouches are available for Trumpet, Cornet / French Horn, Trombone and Tuba