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A carefully selected Bach mouthpiece can help improve a trombone player's embouchure, attack, tonguing and endurance. Vincent Bach was a rare combination of artist and engineer. A mechanical genius and acclaimed trumpet soloist, his instruments and mouthpieces are used today in every major studio and orchestra in the world. Bach personally designed the tools and composed the plans that continue to set the high standards for making all Bach parts today. Choosing the perfect mouthpiece is often more difficult than choosing the perfect instrument. Your success as a musician depends on the choice of equipment that will do justice to your capabilities. -Vincent BachModel No. / Depth of Cup / Approx. Cup Dia. / Rim Shape / Description 3 / Medium deep / 26.26 mm / Medium wide, well rounded. / Extra-large cup for players with a robust embouchure. 4 / Medium / 26.00 mm / Medium wide, well rounded. / Very large cup; principally used by players having healthy, strong embouchures. 4C / Medium shallow / 25.75 mm / Medium wide, well rounded. / Large cup with a brilliant tone. Requires a powerful, natural embouchure. 5 / Medium / 25.50 mm / Medium wide, semi-flat. / For players with good, natural embouchures. Rather large cup. Produces a full, mellow, sonorous tone. 5G / Deep / 25.50 mm / Slightly wider, gradually lowered to outside. / Same as No.350-5 except for .276 throat and #429 backbore (same as No.341-5G but with small shank). 5GB / Deep / 25.50 mm / Medium thin, very well rounded. / Same as No.350-5 except for thin rim (same as No.341-5G but with small shank). 5GS / Medium / 25.50 mm / Medium wide, semi-flat. / Same as No. 5 but with larger G throat and #420 backbore. 6 / Medium / 25.50 mm / Medium wide, well rounded. / Fairly large cup. For players with a strong embouchure. Full, solid, mellow tone.. 6-1/2A / Medium deep / 25.40 mm / Medium wide, well rounded. / Slightly larger than medium with standard-size throat and backbore. Rich, compact tone of large volume. 6-1/2AL / Medium deep / 25.40 mm / Medium wide, well ro