The largest of the Denis Wick Helleberg mouthpieces. Very deep with a large bore. This produces a massive, organ-like tone. Perfect for large BB? tubas and 6/4 CC tubas. The gold rim helps with flexibility and gives this model a distinctive look. - the manufacturer
• Cup Diameter: 32.50 mm • Rim Width: 7.0 mm • Bore Size: 8.45 mm • Back Bore: V-type