Bach mouthpieces are designed to meet every conceivable playing need and have for nearly three quarters of a century. A Bach mouthpiece can make a good instrument play better. Volume and excellent intonation; ease of response in the high and low register; rich, uniform timbre throughout the range; resistance calculated to increase the player’s endurance - these characteristics explain why the best professional artists choose Bach.

Small Shank Tenor Trombone, Baritone & Euphonium Mouthpieces Empty Space Model Cup Depth Approx Cup Dia.  Rim Shape

3

Medium deep 26.6 mm Medium wide, well rounded 4
Medium 26 mm Medium wide
4C Medium shallow 25.75 mm
Medium wide, well rounded
5 Medium 25.5 mm Medium wide, semi-flat 5G Deep 25.5 mm Medium wide, semi-flat
5GB Deep 25.5 mm Medium thin, very well rounded 5GS Medium  25.5 mm Medium wide, semi-flat
6 Medium 25.5 mm Narrow 6 1/2A Medium deep 25.4 mm Medium wide 6 1/2AL Medium deep
25.4 mm Narrow 6 1/2AM Medium deep 25.4 mm Medium wide, well rounded 6 3/4C Medium shallow 25 mm Medium wide, well rounded 7 Medium 24.75 mm Medium wide, not too sharp 7C Medium shallow 24.75 mm Medium wide, not too sharp 8 Medium 24.75 mm Slightly wide and flat 8 1/2BW Medium shallow 24.75 mm Very wide, well rounded 9 Medium deep 24.72 mm Medium wide 11 Medium deep 24.7 mm Medium wide 11C Medium shallow 24.7 mm Medium wide 12 Medium 24.5 mm Medium wide 12C Medium 24.5 mm Medium wide 12E Very shallow 24.5 mm Medium wide 14D Shallow 24.5 mm Medium wide 14 1/2D Shallow 24.5 mm Medium wide 15 Medium deep 24.4 mm Medium wide 15C Medium shallow 24.4 mm Medium wide 15CW Medium shallow 24.4 mm Very wide, well rounded 15D Shallow 24.4 mm Medium wide 15E Very shallow 24.4 mm Medium wide 15EW Very shallow 24.3 mm Extra wide cushion, well rounded 17 Medium 24.2 mm Medium wide 17C Medium shallow 24.2 mm Medium wide 17D Shallow 24.2 mm Medium wide 18 Medium 24.2 mm Fairly wide, flat 18C Medium shallow 24.2 mm Fairly wide, flat 18D Shallow 24.2 mm Fairly wide, well rounded 19 Medium deep, V-shaped cup 24 mm Medium wide, fairly flat 22 Medium 23.92 mm Medium wide 22C Medium shallow 23.92 mm Medium wide 22D Shallow 23.92 mm Medium wide, slightly rounded Large Shank Tenor & Bass Trombone Mouthpieces Empty Space Model Cup Depth Approx Cup Dia.  Rim Shape Throat BB

1G

Deep 28 mm Medium thin, well rounded .319” 800S

1 1/4G

Deep 27.5 mm Medium thin, well rounded .276” 429

1 1/4GM

Deep 27.5 mm Medium thin, well rounded .319” 800S

1 1/2G

Deep 27 mm Medium thin, well rounded .276” 429

1 1/2GM

Deep 27 mm Medium wide, well rounded .319” 800S

2G

Deep 26.75 mm Medium narrow .276” 429

3G

Deep 26.26 mm Medium wide, well rounded .276” 429 4G
Deep 26 mm Medium wide, slightly rounded
.276” 429 4GB Deep 26 mm
Medium thin, very well rounded
.276” 429 5G Deep 25.5 mm Medium wide, semi-flat
.276” 429 5GL Medium deep 25.5 mm Medium wide, semi-flat .276” 429 5GB Deep 25.5 mm Medium thin, very well rounded .276” 429 5GS Medium deep 25.5 mm Medium wide, semi-flat
.276” "G" 420 (modified) 6 1/2A Medium deep 25.4 mm Medium wide, well rounded
.276” 429 6 1/2AL Medium deep
25.4 mm Medium wide, well rounded
.276” "G" 420 6 1/2AM Medium deep 25.4 mm Medium wide, well rounded .276” "F" 413