You will find that the brushes produced by OTIS will give you many times the life of most brushes. Each 2 pack contains one bronze and one nylon bore brush. The caliber-specific brushes are color-coded and have the size indicated on the stem, ensuring you grab the right brush every time. Otis brushes have a proprietary Tufcor core wire that is corrosive-resistant and has a tighter twist for better bristle retention and brush life - plus twice the fill of other brushes with bristles right to the end. With Otis brushes you get superior quality and precision cleaning

Specifications and Features:
For calibers: .40, .401, .404, .405, .41, 10MM, 10.75MM
8-32mm thread size
2" brush length
Superior construction
Precision thread with no weak undercut
Tufcor proprietary core wire that is corrosive resistant, has a tighter twist for better
bristle retention, and can be used with all firearm cleaning chemicals
Size stamped on size and color coded wires