There are two K&G cup sizes for each bass trombone mouthpiece rim diameter, thus enabling the player to benefit from all the different playing characteristics without any rim profile change and, therefore, giving a settled embouchure.

The E cup is the larger of the two K&G bass trombone cups. This unique design gives a robust bass sound but still remains totally focused. The K&G bass trombone E cup offers an open feel and is typically the choice of many orchestral bass trombonists. The overtones are specifically designed such that the bass trombone sound with the E cup remains stable and consistent in all registers.
 

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