The amazing spot cleaning brush tip quickly scrubs away rust and corrosion without solvents or harsh chemicals Over 20,000 cleaning, glass fibers in a pen point Excellent for cleaning marine radios, fishing reels, lures and much more There are thousands of uses for this product in the home as well as on the boat. Rather than scraping corroded electric contacts with a screw driver or metal object the Corrosion Buster pen removes it faster and 100% safely with no chance of shorting anything out because the pen has no metal parts. Everyone working on electronics should have one of these pens in their pocket