I emailed TubaExchange directly regarding the mouthpiece, as the guy next to me in community band borrowed one, and as it did really improve his tone, I was curious as well. Here is my reply, which I never got around to following up on:
Thank you for your E-mail. I am glad to hear that you are intrigued by our Rose model tuba mouthpiece.
Please contact me at 1-800-869-8822, and I will be glad to give you the mouthpiece specifications that you requested. Our store hours are 9:00AM to 5:00PM, Eastern time, Monday through Friday. If you wish, you may contact me, Vince Simonetti, after hours, on my cell phone, which is 919-599-3791.
Thank you again, and I look forward to hearing from you.
Sincerely,
Vincent Simonetti
The Tuba Exchange, Inc.
1825 Chapel Hill Road
Durham, NC 27707
1-800-869-8822
Cell: 919-599-3791
www.tubaexchange.com