Otis' All Purpose Receiver Brushes allows you to choose the right brush for the right project. They give you the ability to scrub places where carbon, powder, and copper residue hibernate. The softest is the nylon bristled brush, followed by a slightly more aggressive blue nylon bristled brush, but the most aggressive is the bronze bristled brush.
This pack comes with three brushes total: one bronze, one nylon, and one blue nylon.
Determined at checkout.