100% cotton, these patches work with rifles, shotguns or pistols. By offsetting their position on the jag, centering them or doubling the patch thickness, a variety of calibers and gauges can be accommodated with this one size. 2-1/2" diameter, works well with .45 and .54 Black Powder and .375 and .45 Centerfire. 250/bag. For more Muzzle Loading Accessories Click Here!