Clarinet
Model 3C 4C 5C 6C 7C
Eb Clarinet Tip opening (mm) 0.95 1.00 1.05 1.10 1.15
Facing length (mm) 17.0 17.0 17.0 17.0 17.0
Bb/A Clarinet Tip opening (mm) 1.00 1.05 1.10 1.20 1.30
Facing length (mm) 19.0 19.0 19.0 19.0 19.0
Eb Alto Clarinet Tip opening (mm) 1.30 1.40 1.50 1.60 1.70
Facing length (mm) 22.0 22.0 22.0 22.0 22.0
Bb Bass Clarinet Tip opening (mm) 1.60 1.70 1.80 1.90 2.00
Facing length (mm) 31.0 31.0 31.0 31.0 31.0

Saxophone
Model 3C 4C 5C 6C 7C
Bb Soprano Saxophone Tip opening (mm) 1.15 1.20 1.25 1.30 1.35
Facing length (mm) 19.0 19.0 19.0 19.0 19.0
Eb Alto Saxophone Tip opening (mm) 1.50 1.60 1.70 1.80 1.90
Facing length (mm) 23.0 23.0 23.0 23.0 23.0
Bb Tenor Saxophone Tip opening (mm) 1.60 1.70 1.80 1.90 2.00
Facing length (mm) 24.0 24.0 24.0 24.0 24.0
Eb Baritone Saxophone Tip opening (mm) - - 2.10 - -
Facing length (mm) - - 28.0 - -

Comments
Model Clarinet Saxophones
3C Easy control and good response from lower to higher ranges, even for beginners Suitable for beginners, helps bring out distinctive, clear sound with good response in high and low registers
4C Helps obtain a well-balanced tone over all octaves, for professionals and beginners alike Easy to obtain a balanced, clear, and focused tone in any octave, ideal for professionals and beginners
5C Facilitates a richer, fuller volume than 4C, with a greater tonal variety Provides a somewhat richer tone with greater variety of colors than 4C and excellent flexibility and response. Popular with soloists
6C An excellent mouthpiece for experienced players seeking powerful volume, strong tone, and rich tone variety Powerful volume and rich tonal variations, excellent for experienced players
7C A jazz favorite for penetrating volume with a rich, strong sound and precise tonality Rich, bold, powerful volume and accurate attacks, well suited for jazz