For Kruspe Horns

These cups are optimized for Kruspe-style horns (Conn 8D & Frenemies).  They're cut with an American shank ("Morse 0" though don't tell your machinists that's what the horn community calls them) and will fit any standard American receiver.  Nothing says you have to have a Kruspe-style horn to enjoy these - reach out if you have any compatibility questions.