3 Valve Guides - Style with Single Slot on Piston Spring Barrel

Fits:
T602 Holton  Bb Trumpet  Student  (models with single slot design)
ST550 Holton  Bb Trumpet  Intermediate  (models with single slot design)
TR690 Holton  Valve Trombone  Professional 
C602 Holton  Cornet  Student 
C603 Holton  Cornet  Student 

Trumpet Holton 3 Valve Guides piston:T602,ST550 Cornet C602,C603,trombone TR690