Otis Technology Nylon AP Brushes 10 Pack Blue BLU. Features of Otis Technology Nylon AP Brushes 10 Nylon All Purpose Brushes Double ends allow for large surface scrubbing on one end and precision cleaning with the smaller end. Removes fresh carbon or powder residue but won't scratch your firearm finish For everyday use and can be used on virtually any surface including wood surfaces Nylon bristled brush meets Mil. Spec. Package Contents: Otis Technology Nylon AP Brushes Otis Technology FG-316-10 BLU: Nylon AP Brushes 10 Pack Blue