Blackburn X C Trumpet brass it retains the dimensions that

it retains the dimensions that are needed for the instrument to play in tune and have a centered tone

The rim is only half the equation

the Blackburn medium bore Bb offers a rich warm tone while still maintaining the distinct feeling of a medium bore horn

without sacrificing the upper register

Blackburn X C Trumpet brass it retains the dimensions thatIntroduced in 1987, the MD19X model C trumpet has Cliffs historically original X design. The elongated leadpipe offers superior intonation and slotting, as well as giving the horn an optimal balance in the hands. The legendary MD19A24S bell is the embodiment of warmth, projection, and superior intonation. The summation of these features results in what players come to know as the 'Blackburn sound'