Number 13Â Bore Cleaner and 100% cotton patches combined, they work to clean fouling from muzzleloaders. By offsetting their position on the jag, centering them or doubling the patch thickness, a variety of calibers and gauges can be accommodated with one size. Number 13Â Bore Cleaner and 100% cotton patches combined, they work to clean fouling from muzzleloaders. By offsetting their position on the jag, centering them or doubling the patch thickness, a variety of calibers and gauges can be accommodated with one size. 100/Jar. Notice for California consumers: WARNING: Cancer www.P65Warnings.ca.gov Technical Specifications Diameter 2.5" works with .45.58 cal 100/Jar.