Holton Green Valve felt for the top caps.
These fit Holton T602 and Collegiate Trumpets as well as many other Holton models.
These felt are the proper thicker thickness that Holton top caps require. We see many other sellers online selling thinner felt for Holton that were not the proper thickness that were on Holton trumpets originally from the factory.
These felt provide very quiet valve action assuming the valves and casing/cylinder are straight and the the separate valve stem felt or cork is also in good condition and not compressed.
These felt measure: 11/16" OD 7/16" ID 3/32" thick