Small shank tenor trombone mouthpieces. • Model 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 rounded. / The same rim and cup as No. 6-1