Kanstul ZKT 1510 S C-trumpet, Signature Series, Ø 11,79mm bore size (.464"), Ø 126,6mm bell diameter (5"), #7 copper bell, #25-O reverse mouthpipe, 2 amado waterkeys, metal valve guides, hand- fitted monel pistons, ring on the 1st & 3rd slide and stop screws, silver plated, incl. Kanstul deluxe case and mouthpiece