The Thompson/Center Number 13 Bore Cleaner Patches help to clean fouling and unwanted residue from muzzleloader bore. A variety of calibers and gauges can be accommodated with one size by offsetting their position on the jag, centering them, or doubling the patch thickness. The Thompson/Center No. 13 Bore Cleaner Patches are 100% cotton knapped that are pre-lubricated with No.13 bore cleaner. These cleaning patches come in a re-sealable plastic jar of 100 patches.