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Vincent Bach was a rare combination of artist and engineer. He was constantly changing his mouthpiece designs until the mid 1960’s when they became more standardized.

The formalization of the 27 throat and backbore to cup letter (A=24, B=7, C= 10, etc.) created a standard for the mouthpiece making that is still used today. These standards are known today as the Classic Series.

1G Deep 28.00mm Medium thin, well-rounded Extra large and deep for extraordinary power and depth of tone. Among the largest and most powerful bass trombone mouthpieces produced today. .319" throat/800S backbore.
1 1/4G Deep 27.50mm Medium thin, well rounded. Cup diameter is smaller than 1G, but still very large and deep, with the sonority preferred by the modern American school. .276" throat/429 backbore.
1 1/4GM Deep 27.50mm Medium thin, well rounded. Same rim and cup as 1 1/4G, but with a larger throat and backbore for large, powerful sound, well in tune. .319" throat/800S backbore.
1 1/2G Deep 27.00mm Medium wide, well rounded. A large mouthpiece with powerful tone in the low register and great carrying power. For many years, the standard mouthpiece for the serious bass trombone player. .276" throat/429 backbore.
1 1/2GM Deep 27.00mm Medium wide, well rounded. Larger throat and backbore than the 1 1/2G results in less resistance, larger dynamic range, deeper, warmer sound. .319" throat/800S backbore.
2G Deep 26.75mm Medium narrow Deep, full, resonant tone; big low register even through the pedal tones. .276" throat/429 backbore.
3G Deep 26.26mm Medium wide, well rounded. Same rim shape and diameter as No. 3 small shank tenor trombone but with a deep bass trombone cup, throat, and backbore to facilitate pedal tones. .276" throat/429 backbore.
4G Deep 26.00mm Medium wide, slightly rounded. Same rim shape and diameter as No. 4 small shank tenor trombone. A versatile, large-diameter mouthpiece especially useful when only one trombone is used for both the upper and very low register. .276" throat/429 backbore.
4GB Deep 26.00mm Medium thin, very well-rounded. Same as 4G except for rim.
5G Deep 25.50mm Medium wide, semi-flat. Same rim shape and diameter as No.5 small shank tenor trombone. Similar playing characteristics to 4G with a slightly smaller cup diameter. .276" throat/429 backbore.
5GL Medium deep 25.50mm Medium wide, semi-flat. Old style, shallower model than 5G, facilitates upper range. .276" throat/429 backbore.
5GB Deep 25.50mm Medium thin, very well rounded. Same cup, throat and backbore as the 5G with a more rounded rim. .276" throat/429 backbore.
5GS Medium deep 25.50mm Medium wide, semi-flat. Shallower "G"-style cup with smaller throat and backbore than 5G. Produces an easy high register, slightly brighter sound. .261" G throat/429 (modified) backbore.
6 1/2A Medium deep 25.40mm Medium wide, well rounded. Same rim and cup as 6 1/2A small shank tenor trombone, but with full bass trombone throat and backbore for a rich, compact sound of large volume. .276" throat/429 backbore.
6 1/2AL Medium deep 25.40mm Medium wide, well rounded. The same cup, throat, and backbore as 6 1/2AL small shank tenor trombone but with bass shank. It requires a well-developed embouchure. .261" "G" throat/420 backbore.
6 1/2AM Medium deep 25.40mm Medium wide, well rounded. The same rim, cup, throat, and backbore as 6 1/2AM small shank tenor trombone mouthpiece, but with bass shank. .257" "F" throat/413 backbore.