Description for nylon brush More barrels are ruined by improper cleaning than by shooting. Nylon bristles are gentle on bores and a great way to get solvent into the bore and break up particles. The bristles are made from high-quality nylon, which is much softer than brass but more than aggressive enough to scour away lead fouling, copper fouling, and powder residue. Important Note 0.22 inch= .22 caliber 6.5MM=0.26 inch=.260 caliber 0.30 inch=.30 caliber 9MM=0.357 inch=.357 caliber Nylon Brush Nylon bristle brush for gun cleaning rod. .17 Caliber is 5-40 threaded. Others are standard 8x32 male threaded. Core Material: Steel wire Core End:Looped Bristle Material:Nylon Description for gun cleaning patch Patches are great for cleaning firearms, optics, musical instruments, and lab equipment Patch Material: Made of extremely durable, soft and thick material Highly absorbent: Doesn't leave any fibers threads or lint behind after use. Great for polishing and buffing. Patch Size: 3 inch * 3 inch approximately Patch Shape: Square