Item Description

Bach trumpet 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 no. 1 with the largest cup diameter, to model no. 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".

Empty Space
Model	Cup Depth	Approx Cup Dia.	Rim Shape
1	Deep	17.5 mm	Medium thin
1X	Deep	17 mm	Medium wide
1B	Medium deep	17 mm	Medium wide
1C	Medium	17 mm	Medium wide
1D	Medium shallow	17 mm	Medium wide
1E	Shallow	17 mm	Medium wide
1 1/4C	Medium	17 mm	Medium wide
1 1/2B	Medium deep	17 mm	Medium wide, not too sharp
1 1/2C	Medium	17 mm	Medium wide, not too sharp
2	Deep	16.5 mm	Medium wide, lowered toward the outside
2C	Medium	16.5 mm	Medium wide, lowered toward the outside
2 1/2C	Medium	16.4 mm	Medium wide, lowered toward the outside
2 3/4C	Medium	16.4 mm	Medium wide, lowered toward the outside. Slightly more narrow than No. 21 ⁄ 2C.
3	Deep	16.3 mm	Medium wide
3B	Medium deep	16.3 mm	Medium wide
3C	Medium	16.3 mm	Medium wide
3CW	Medium	16.3 mm	Slightly wider, lowered to outside
3D	Medium shallow	16.3 mm	Medium wide
3E	Shallow	16.3 mm	Medium wide
3F	Extra shallow	16.3 mm	Medium wide
5A	Very deep	16.25 mm	Medium wide, rounded inside edge
5B	Medium deep	16.25 mm	Medium wide, lowered toward the outside. Medium sharp edge
5C	Medium	16.25 mm	Medium wide, well rounded toward the inside and outside, fairly flat
5MV	Medium deep	16.25 mm	Medium wide, lowered toward the outside. Medium sharp edge
5SV	Shallow	16.25 mm	Medium wide, lowered toward the outside. Medium sharp edge
5V	Very deep	16.25 mm	Medium wide, lowered toward the outside. Medium sharp edge
6	Deep	16.2 mm	Medium wide, not too sharp
6B	Medium deep	16.2 mm	Medium wide, not too sharp
6BM	Medium deep	16.2 mm	Medium wide, not too sharp
6C	Medium	16.2 mm	Medium wide, not too sharp, rather flat
7	Deep	16.2 mm	Medium wide, lowered toward the outside. Medium sharp inside edge
7A	Very deep	16.2 mm	Medium wide, lowered toward the outside. Medium sharp inside edge
7B	Medium deep	16.2 mm	Medium wide, lowered toward the outside. Medium sharp inside edge
7BW	Medium deep	16.2 mm	Medium wide, lowered toward the outside. Medium sharp inside edge
7C	Medium	16.2 mm	Medium sharp inside. Well-rounded edge with a perfect grip.
7CW	Medium	16.2 mm	Slightly wider, gradually lowered toward the outside
7D	Medium shallow	16.2 mm	Medium wide, lowered toward the outside.
7DW	Medium shallow	16.2 mm	Slightly wider
7E	Shallow	16.2 mm	Medium wide
7EW	Shallow	16.2 mm	Slightly wider
8	Deep	16.2 mm	Fairly wide with slightly flatter surface than No. 7. Rounded inner edge
8B	Medium deep	16.2 mm	Fairly wide with slightly flatter surface than No. 7B. Rounded inner edge
8C	Medium	16.2 mm	Fairly wide with slightly flatter surface than No. 7C. Rounded inner edge
8 1/2	Deep	16.1 mm	Medium wide, lowered toward the outside. Med. sharp inside edge
8 1/2A	Very deep	16.1 mm	Medium wide with rounded inner edge
8 1/2B	Medium deep	16.1 mm	Medium wide, lowered toward the outside. Med. sharp inside edge
8 1/2C	Medium	16.1 mm	Medium wide
8 3/4	Deep	16.1 mm	Medium wide, not too sharp
8 3/4C	Medium	16.1 mm	Medium wide, slightly flat
9	Deep	16.05 mm	Medium wide, lowered toward the outside
9A	Very deep	16.05 mm	Medium wide, well rounded
9B	Medium deep	16.05 mm	Medium wide, lowered toward the outside
9C	Medim	16.05 mm	Medium wide, lowered toward the outside
9D	Medium shallow	16.05 mm	Medium wide, lowered toward the outside
10	Deep	16 mm	Fairly wide with rather broad, flat surface
10B	Medium deep	16 mm	Fairly wide with rather broad, flat surface
10C	Medium	16 mm	Fairly wide with rather broad, flat surface
10 1/2A	Very deep	15.9 mm	Medium wide, well rounded
10 1/2C	Medium	15.9 mm	Medium wide
10 1/2CW	Medium	15.9 mm	Extra wide, high toward the inner edge
10 1/2D	Medium shallow	15.9 mm	Medium wide, high toward the inner edge
10 1/2DW	Medium shallow	15.9 mm	Extra wide, high toward the inner edge
10 1/2E	Shallow	15.9 mm	Medium wide, high toward the inner edge
10 1/2EW	Shallow	15.9 mm	Extra wide, high toward the inner edge
10 3/4A	Very deep	15.75 mm	Medium wide, well rounded
10 3/4CW	Medium	15.75 mm	Extra wide
10 3/4EW	Shallow	15.75 mm	Extra wide
11A	Very deep	15.7 mm	Medium wide, well rounded
11B	Medium deep	15.7 mm	Medium wide, well rounded
11C	Medium	15.7 mm	Medium wide
11D	Medium shallow	15.7 mm	Medium wide, well rounded
11DW	Medium shallow	15.7 mm	Extra wide
11EW	Shallow	15.7 mm	Extra wide, high toward the inner edge
11 1/2A	Very deep	15.65 mm	Medium wide, well rounded
11 1/2C	Medium	15.65 mm	Medium wide
11 3/4C	Medium	15.6 mm	Medium wide, well rounded
11 3/4CW	Medium	15.6 mm	Fairly wide, rather flat, not too sharp
12	Deep	15.2 mm	Broad, rather flat.
12B	Medium deep	15.2 mm	Broad, rather flat.
12C	Medium	15.2 mm	Broad, rather flat.
12CW	Medium	15.2 mm	Broad, rather flat toward the inside
17	Deep	15.1 mm	Medium wide.
17C	Medium	15.1 mm	Medium wide.
18	Deep	15.1 mm	Broad, rather flat.
18C	Medium	15.1 mm	Broad, rather flat.
20C	Medium	15 mm	Medium wide.