Conn Helleberg Tuba Mouthpiece

We purchased this for my 8th grade son for playing the Tuba at school. I called and the staff and asked a lot of questions and they answered every one very patiently. They were very helpful as I knew nothing about the process. We went with the Gold and they said they dipped it there and fully guarantee the quality. It was perfect upon arrival. My son said that the difference in the gold and the ones he used at school is very noticeable. It has hardly shown any kind of where other than the tip you stick into the tuba of course. Sadly, the kid lost it so we will be buying another one from Dillon Music shortly. And he has lots of chores to do to pay us back!