These brass mouthpieces are produced with advanced computer design and manufacturing technology for unmatched precision, smooth attack, and easy playability. Ideal weight for all-around use and available in a variety of configurations to suit every player. Yamaha Standard Series Trombone Mouthpiece (Large Shank) 48 These brass mouthpieces are produced with advanced computer design and manufacturing technology for unmatched precision; smooth attack; easy playability. Ideal weight all-around use available in a variety of configurations to suit every player.