willie's MUSE J7 This mouthpiece is designed for jazz tenor trombone and is equivalent to a Bach 7C. I used it for about a year, but I'm selling it now because I no longer use it. In terms of playing feel, it gives a powerful sound across the board, from the low register, which tends to be thin on small-bore trombones, to the high register. The rim edge is more defined than a 7C, so the response is good, but it might be a little tiring for those who press when they play. It's recommended for those looking for a mouthpiece of the same size with a different feel. *Please understand that this is a used item. --- Shank: Small Inner Rim Diameter: 25.10 Throat Diameter: 5.9 Cup Depth: Medium Shallow Total Length: 79.5