Tenor Horn.

Rim inside diameter (mm)19.51918.518
1D3D5D7D
Bach67
JK1A
1B
1C
1D
2A
2B
2C
2D
3A
3B
3C
3D
Wick1
1A
2
2A
34
Yamaha38
D4
37
C4
Alliance2A
Prestige
2
3
3A