Rim shape is described for each individual model. Model numbers progress numerically from model #1 with the largest cup diameter, to model #20C with the smallest cup diameter.Cup depths are notated with letters. "A " cups are the deepest; standard cups have no letter designation; progressively shallower cups are marked B through F. "A " Models have very deep cups, #24 backbores, and emit a large, dark sound.Models with no letter designation have deep cups, #10 backbores, and produce a rich, full, clear tone. "B " Models have medium deep cups, #7 backbores, and have a full, Teutonic tone with great volume. "C " Models have medium cups, #10 backbores, and are preferred by many players that alternate between Bb, C and D trumpet. "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.Model No. - Rim ShapeDescription 5A - Medium wide, rounded inside edgeA fairly large cup with a dark, full, mellow tone. 5B - Medium wide, lowered toward the outside. Medium sharp edgeA precise rim and a fairly large cup. The tone is vivid and full. 5V - Medium wide, lowered toward the outside. Medium sharp edgeV style cup with larger #20 throat and #25 backbore. Free blowing, very flexible. 5MV - Medium wide, lowered toward the outside. Medium sharp edgeMedium deep V style cup with #25 throat and #25 backbore. Good commercial sound. 5SV - Medium wide, lowered toward the outside. Medium sharp edgeShallow V style cup with #25 throat and #25 backbore. 5C - Medium wide, not too sharpFor players with a strong embouchure who do not like a sharp edge. The tone is lively and rich. 6 - Medium wide, not too sharpProduces a rich, clear tone of substantial body. Its rim shape was preferred by Vincent Bach. (Cornet model comes with #24 backbore as standard.) 6B - Medium wide, not too sharpProduces a beautiful, ringing tone and responds easily. Medium-large size gives the lips sufficient room to execute freely. 6BM - Medium wide, not too sharpSame as No. 6B but larger #26 throat, #24 backbore. Large symphony sound. 6C - Medium wide, not too sharp, rather flatA distinctive C trumpet cup. Its clear tone cuts through the largest bands and orchestras. 7A - Medium wide, lowered toward the outside. Med. Sharp inside edgeWarm, melodious, rich tone approaches the quality of a lyric soprano voice. Free blowing. 7 - Medium wide, lowered toward the outside. Medium sharp inside edge.This popular model produces a colorful, liquid tone which is uniform over the entire scale. Desirable for all-around work. 7B - Medium wide, lowered toward the outside. Med. Sharp inside edgeSlightly livelier timbre than No. 7, full in the low and middle registers, responds easily on high tones. Warm, rich sound. Well suited for all-around use. 7BW - Slightly wider, lowered toward the outside. Med. Sharp inside edgeThe same features as No. 7B with a cushion rim for players with slightly heavier lips. 7C - Medium wide, lowered toward the outside. Medium sharp inside. Well-rounded edge with a perfect gripProbably the most widely used model in the world. Its brilliant tone is preferred by school musicians and by artists. 7CW - Slightly wider, gradually lowered toward the outsideThe same as No. 7C with a comfortable cushion rim contour. Very practical for strenuous work and players with large lips.