Thank you for viewing. Griego BB2-BT Euphonium (Trombone) Mouthpiece supervised by Dr. Brian Bowman Silver plated V cup For large bore With a presentation box This mouthpiece is supervised by the world-renowned euphonium player, Dr. Brian Bowman. The BB2-BT has a V cup with a shallow depth. It is a mouthpiece that makes the high range very easy to play. The inner rim diameter is said to be between GRIEGO 6.5 and 7. I purchased it new, but I haven't used it much, so although there are some minor scratches on the shank, it is generally in good condition.