I needed a brush to clean the internal connectors of my remotes (corrosion). I used baking soda and a toothbrush, but someone recommended fine wire brushes. She specifically recommended them here. For the price they are great. I was able to remove almost all of the corrosion from the battery terminals on my remotes without having to use liquids or other chemicals. I'm glad I bought this pack. They aren't the most durable but definitely represent excellent value for money.