The cup has an inner diameter of 16.5mm and is a medium depth, between a 7M and a 7S. While not as shallow as a 7S, it makes high notes easier to play, and is a good fit for 2nd or 3rd trumpet in a big band. This is a used item, so please be aware that there are minor insertion marks on the shank. As a general rule, I do not negotiate on price.