Rim sizes;
#1 Inside diameter .690" (17.5mm)/Outside Diameter 1.100" (28mm)
#2 Inside diameter .680" (17.25mm)/Outside Diameter 1.090" (27.7mm)
#3 Inside diameter .670" (17mm)/Outside Diameter 1.080" (27.4mm)
#4 Inside diameter .660" (16.75mm)/Outside diameter 1.075" (27.3mm)
#5 Inside diameter .650" (16.5mm)/Outside diameter 1.065" (27mm)
#6 Inside diameter .640 (16.25mm)/Outside diameter 1.060" (26.9mm)
#7 Inside diameter .630 (16mm)/Outside diameter 1.055" (26.8mm)
#8 Inside diameter .620" (15.75mm)/Outside diameter 1.055" (26.8mm)
#9 Inside diameter .610" (15.5mm)/Outside diameter 1.050" (26.7mm)
Cup depths;
BC - Extremely deep. British Cornet" style cup. Tradition, classic. Very deep cup, full rich tone. Produces a warm tone with great volume of sound (when required).
MBC - Medium British Cornet to facilitate easier playing in the upper register without losing the full sound.