Bach trumpet, cornet, and fluegelhorn mouthpieces have been designed in an orderly progression from the largest to the smallest diameters, and from the deepest to the most shallow cup, all with a choice of rim designs.
Rim shape is described for each individual model. Model numbers progress numerically from model#1 with the largest cup diameter, to mmodel #20C with the smallest cup diameter.
"A" Models have very deep cups, #24 backbores, and emit a large, dark sound.
"B" Models have medium deep cups, #7 backbores, and have a full Teutonic tone with great volume.
"C" Models have medium deep cups, #10 backbores, and are preferred by many players who alternate between Bb, C, and D trumpets.
"D" Models have medium-shallow cups, #76 backbores, and produce a sparkling, brilliant tone, especially in the high register. Artists who continually play in the extreme high register use them to advantage.
"E" Models have shallow cups, #117 backbores, and are designed for use on soprano and piccolo trumpets. Also preferred by extreme high-register players.
"F" Models have extra-shallow cups, #76 backbores, and are also preferred by extreme high-register players.
"V" Models have V style cups. "V" designates a very deep cup, #20 throat and #25 backbore; "MV" designates a medium deep cup, #25 throat and #25 backbore; "SV" designates a shallow cup, #25 throat, and #25 backbore. "W" Models have a wide, cushion rim for soft, thick lips.