Conn Helleberg Series Tuba Mouthpiece in Gold 7B Gold Plated Helleberg Series Tuba Mouthpiece in Gold 7B Gold Plated The Conn Helleberg Tuba Mouthpieces are named after the principal tubist of the Sousa band These mouthpieces are designed to produce a very deep, organ-like tone with excellent volume The Conn Helleberg Tuba Mouthpieces are named after the principal tubist of the Sousa band These mouthpieces are designed to produce a very deep, organ-like tone with excellent volume