Cleans (Caliber): .22 - .45; Precision thread with no weak undercut; Tufcor proprietary core wire; Corrosive resistant; Tighter twist for better bristle retention; Can be used with all firearm cleaning chemicals; Twice the fill as other brushes, the stem is cold welded to the core, and the brushes are filled to the end; Each brush features the size stamped on the stem and color-coded core wire to easily identify the brush size; 10 Pack (Brushes Included: (2) 22, 25, 27, (2) 30, 35, 38, 40, 45 Cal); Limited Lifetime Warranty