Valve Guides for Holton Collegiate Brazilian Made Baritone, Euphonium, & Tubas

4 Valve guides for Brazilian made Holton Collegiate B470R, B460R, B480R, B490R, BB450 & BB460 Baritone, Euphonium, & Tubas.  Not for a Conn-Selmer/Holton manufactured euphonium (serial # starts with BC).