The Bach 1.5G Megatone Trombone Mouthpiece Large Shank is a uniquely styled mouthpiece for beginners and professionals alike. The Bach 1.5G mouthpiece features a deep cup and medium-wide well-rounded rim for musicians needing a powerful tone in the low register. For many years the 1.5G was the most popular mouthpiece for serious bass trombone players. The extra mass found on the outside of the Bach 1.5G Megatone mouthpiece darkens the sound and allows musicians to achieve greater dynamics without distortion. The Bach Megatone trombone mouthpiece is available in different sizes.