Northern Brass 3-64**** Trumpet Mouthpiece .640 inner diameter
This has the medium shallow **** cup but with the comfortable #3 rim which is similar to the GR standard rim width but has a softer bite.There is a sufficient amount of what many refer to as "undercut". A great choice for those who bottom out on the 6a4a the Shew models and similar mouthpieces. Those who like the 3-64*** often add this model to their arsenal for when a darker broader sound is desired yet still efficient enough to tackle the most difficult trumpet literature. GR#1 back bore is used.
Please see the Northern Brass Mouthpieces Description section for more info on the rims and cups.
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