To expand on Mikes answer ...

They are rubber rollers that are used in printing to spread ink on platens (I
think that is the word).

They are great, though you need to get a good/expensive one. The cheap ones
are not round (not a real issue) or straight (a problem).

Vince

Mike Henry wrote:

"jim rozen" wrote in message
...
In article , John Hofstad-Parkhill
says...

Prussian blue works pretty good. I would add a rubber brayer to the tool
list.

Oooh. Another widget. What's a 'brayer?'

I believe it's a small rubber roller - Hobby Lobby sells them.