Warburton 12 mouthpiece backbore with 23 throat. Intended for C-Trumpet symphonic/orchestral use. Condition is used. May show some cosmetic wear and insertion marks but nothing that would impact playability. Happy to send additional pictures upon request.
Description from Warburton's website:
"After careful testing and design, we've found the optimal backbore length and dimensions to suit the tendencies of the C Trumpet."
"10, 11, 12 - Very large "Symphonic" sizes. These models have very little resistance and offer the strong player the potential for the ultimate in full, rich sound."