Beginner

• Classic 12CS, 10CS  (similar to Bach 12 diameter)
• Heritage 12CS, 10CS  (similar to Bach 12 diameter)

Step-Up

• Classic 6BS or 6BL (similar to Bach 6 1/2 AL)
• Heritage 6BS or 6BL  (similar to Bach 6 1/2 AL)

Advanced

• Classic 5AL, 5ABL, 6AL, 6ABL  (Similar to Bach 5 and 6 diameters)
• Heritage 5AL, 5ABL, 6AL, 6ABL (Similar to Bach 5 and 6 diameters)

Marching Band

• Classic 6BL, 6BS, 7CS

• Heritage 6BL, 6BS, 7CS

Jazz Band, Lead

• Classic 7CS, 9BS,  10CS, 12CS,  (Similar to Bach diameters 7 and 12)

Not sure what these numbers mean? Read Mouthpieces 101. 

Check out Denis Wick Trombone mouthpieces in action in the below Denis Wick Artist playlist.