They are exact reproductions of the B-3 type upstop and downstop felts. An essential part of any Hammond console restoration or busbar lube job, it helps restore the "new feel" and quiet operation to the keyboard. Easily installed on late A-100, B-3, C-3, D-100, and RT-3 organs. (These organs are identified by front strips that are secured with Phillips head screws.) Also usable on earlier consoles. However, front strip removal on these organs requires substantial disassembly of the keyboards.