Model No. Depth of Cup Approx. Cup Dia. Throat Backbore Rim Shape Description
1½ C Medium 17.00mm 27 Bach Style 10 Medium-wide, not too sharp. Large diameter, medium cup.
3C Medium 16.30mm 27 Bach Style 10 Medium-wide Most popular model. Has a large cup great for all-around use.
5C Medium 16.25mm 27 Bach Style 10 Medium-wide, well rounded toward the inside and outside, fairly flat. This model is best for players with a strong embouchure who do not like a sharp edge.
7C Medium 16.20mm 27 Bach Style 10 Medium-wide, lowered toward the outside. Medium sharp inside. Well rounded edge with a perfect grip. Another very popular model. Has a tone preferred by school musicians and by artists.
10½ C Medium 15.90mm 27 Bach Style 10 Medium-wide Particularly useful to players without a strong embouchure. Ideal for C trumpet.