Kelly Mouthpieces Small Shank Trombone 6-1/2AL Mouthpiece Crystal Orange Small Shank Trombone 6-1/2AL Mouthpiece Crystal Orange Kelly Mouthpieces are made of Lexan polycarbonate material that provides comfort in hot or cold weather gigs This means less fatigue on your chops They are great for Marching Bands, Pep Bans and Festive occasions Kelly Mouthpieces are made of Lexan polycarbonate material that provides comfort in hot or cold weather gigs