Ave!
Coin and Artifact Mini-cleaning brush, Hand-held, 3-Pack
Brass, Fiber & Steel
Sometimes even the smallest brash brush is too large to reach into tiny details on coins and artifacts... Yes or no? These hand-held tools are exactly what you've been seeking.
The size of a ink pen, there is a twister on the end that allows you lengthen or shorten the bristles to your exact needed specification. I use the brass pen as noted above and the fiber pen as a duster as I progress.
Also, the fiber pen, when the length is reduced to only 1-2 millimeters, can be used as a spectacular scrubber on dry (not wet) soft-dirt coins and especially on silvered issues!
Very cool! This set will last you for many years, trust me.
FYI - The steel pen IS NOT suggested for any use on coins or artifacts!