Denis Wick Ultra AT3Y There are minor scratches and shank wear from use, but there is no significant damage or distortion. This is a Helberg-type mouthpiece from the AT series. It has similar specifications to a Laskey 30H, etc. Compared to other similar models, it gives the impression of having the characteristic Denis Wick tone. This is an American shank. Since the universal shank is more common for the AT series, how about this for those looking for an American shank AT? Cup inner diameter: 32.8mm Throat diameter: 8.20mm - For all C tuba. - Deep Helberg-type cup, with a design slightly closer to a V-cup than the AT2U. - Characterized by a rich and uniform tone in all registers.