Non US Orders Will Be Shipped From China Description: The bristles are made from high-quality bronze, which is much softer than barrel steel but more than aggressive enough to scour away lead fouling, copper fouling, and powder residue. Bronze Bristle Brush for Gun Cleaning Rod 8 x 32 male threads. Fits with .30 caliber Core Material:Steel wire Core End:Looped Bristle Material:Bronze Package Includes: 3 pcs Bronze Bristle Brush.