The brass is wonderful, very soft. It is the same size as the brass
brushes sold in the Rio catalog.
Rio probably sells them somewhere else in the catalog, I’d think.
Allcraft certainly does and I expect Otto Frei and others would too,
etc. The key is to look/ask for Platers brushes (as in
"electroplating"). Available with plastic or wood handles, as well
as in other metals. I’ve seen them in steel and in nickle silver as
well as brass. They’re not a cleaning brush, but one for
finishing/burnishing a plated surface.