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 11C - Medium wideA beautiful brilliant C trumpet tone that requires little effort to play in the high register yet with a free low range. 11D - Medium wide well roundedProduces a brilliant tone effective in the high register. Good for players not having a strong embouchure. 11DW - Extra widePlayers with thick fleshy lips especially those who cannot rely on the strength of their lip muscles can use this cushion rim mouthpiece to advantage. Produces crisp easy top tones. 11EW - Extra wide rather high toward the inner edgeA cushion-rim mouthpiece especially designed for the extreme high register. Because of the extra shallow cup the tone is very brilliant piercing and cuts well. For players who have heavier than normal pressure in the high register. 11½A - Medium wide well roundedSimilar to No. 11A but slightly smaller. Produces a rich round tone. 11½C - Medium wideA brilliant scintillating tone very easy response and good all-around register. 11¾C - Medium wide well roundedEasy playing with a compact brilliant tone. Recommended for players with sensitive embouchures and narrow lips. 11¾CW - Fairly wide rather flat not too sharpA cushion rim for players with soft fleshy lips who rely on above average pressure. Responds easily in the high register. 12 - Broad rather flatThis popular model produces a full mellow tone. A good choice for players of the English or Italian school who are accustomed to small mouthpieces and players with heavy weak lips. 12B - Broad rather flatThe same rim as No. 12 with a slightly shallower cup to make the tone more lively. High register responds well. 12C - Broad rather flatBrilliant tone easy high register for trumpeters who have to play forte in the upper range and for players with heavy weak lips have difficulty with the high tones. 12CW - Broad rather flat toward the insideCup diameter and depth are the same as No. 12C extra wide cushion rim. 17 - Medium wideA small mouthpiece with a solid compact tone. Players with thin lips find this model highly satisfactory. 17C - Medium wideA lively clear and brilliant tone for players with thin lips whose embouchures tire easily. 18 - Broad rather flatHas the same cup as No. 17 but a wider rim.