Denis Wick Trombone (Large Bore) Heritage Mouthpiece. [Retail Price: 51,700 yen] This model is favored by trombone players in world-class orchestras, including the London Philharmonic Orchestra. DW3180-5AL The Heritage series features Denis Wick's unique design. The thinness of the rim and cup's upper part provides excellent control and responsiveness. It is easy to play in all registers, and the overtones are superb. Cup Inner Diameter: 25.73 Rim Width: 6.64 Bore Size (Throat): 7.30 Backbore Shape: Barrel Imported from the UK in February 2025. I've decided to sell this one because the inner rim specification suits me better. The current import price is 51,700 yen, but it is sold for around 80,000 yen on Amazon.