Pro-Shot Cleaning Patches are 100% cotton flannel. These patches are designed to absorb foreign material and residue, and carry it through the bore with the least amount of abrasive contact to the barrel’s rifling. Dimensions: 17 to 22 Caliber: 3/4″ x 3/4″ Square 22 to 270 Caliber: 1″ Round; 1-1/8″x 1-1/8″ Square 6mm to 30 Caliber: 1-1/2″ Round 6mm to 7mm Caliber: 1-3/8″ Square 270 to 38 Caliber: 2″ Round 7mm to 38 Caliber: 1-3/4″ x 1-3/4″ Square 38 to 45 Caliber, 20 Gauge, and 410 Bore: 2-1/4″ x 2-1/4″ Square 45 Caliber, 12 Gauge, 16 Gauge: 3″ x 3″ Square