8 Pieces Scratch Brush Pen Set, Pen Style Prep Sanding Brush With Steel, Brass, Fiberglass, Nylon Replacement Tips for Jewelry, Watch, Coin Cleaning, Electronic Applications, Auto Body Work

They are of the quality that you would get as a prize from Chuck E. Cheeses.

Fantastic idea I havent used yet seem to be a little flimsy might break easily I purchased to clean corrosion out of AAA battery compartments on camera equipment. I love the way you can extend and retract the brush Not sure how the plastic will hold up with electronics cleaner spray might melt or the metal tip hold up with simple green or other water based cleaner might rust

I bought these brushes to clean crevices and tight spaces where a regular brush wont fit. The brass and steel bristles are very weak. They are virtually worthless for cleaning. I havent tried the nylon ones.