This new mouthpiece designed by Aaron Tindall is for F tubas. It has a slightly shallower cup than the AT5U and is more bowl-shaped, giving a powerful, well-centred sound which would be ideal in both orchestral and chamber music playing .The rim is designed by Warren Deck and is one of the most comfortable on the market. It features just the right amount of width and bite to give the player a sense of comfort and stability. This mouthpiece produces a rich and vibrant sound with plenty of focus. There is a distinct ‘shelf’ at the bottom of the cup which helps achieve a concentrated power that gives a sound that really projects.