Are hollowed out
steel bronze tubes, hung vertically from a wood frame.
I have seen them in multiples as a chime and tower clock ring of less than 8 bells.
They are suspended by rope from the frame, are very heavy and are rung by a device at the top.
They have a more clangy ring than regular bells.
They appear to be descendents of tubes in old tall case clocks.
The American manufcturers were Durfee, U.S.Tubular, Deagan and a just discovered Rowland H Mayland of Brooklyn.
None appear to be made now.