Non US Orders Will Be Shipped From China 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 .357 caliber Core Material: steel wire Core End: Looped Bristle Material: Bronze Patches are great for cleaning firearms, optics, musical instruments, and lab equipment Patch Material: 100% Cotton Patch Size: 2.95 inch * 2.95 inch Patch Shape: Square Package Includes: 5 pcs Bronze Bristle Brush 50 pcs Gun Cleaning Patches.