Clenzoil's Double-Ended Brass Brush is are recommended for use where a nylon brush may struggle to remove any excess buildup. Brass bristles are tough enough to cut through carbon deposits, but are still soft enough that they will not damage your firearm's steel or coated steel surfaces. The double-ended brush allows for large surface scrubbing on one end and precision cleaning with the smaller end. This brush when used with Clenzoil Field & Range will aid in removing stubborn carbon deposits and powder residue.