These bags, containing 180 patches, are crafted from 100% cotton flannel and are precisely sized to match the following TCS cleaning jags - .22 Cal, .243 Cal (6mm), .25 Cal (6.5), .270 Cal (6.8) and .284 Cal (7mm). When used with our jags, these patches ensure optimal fit and performance across a wide range of firearms. However, in certain cases involving specific short-barrel .22 Cal pistols with tighter-than-average bores, these patches may prove too thick. This issue has been observed with Bersa, Firestorm and Walther pistols. If you own one of these models or a similar short-barrel .22 pistol and encounter unusual resistance, refrain from forcing the jag and patch into the bore. 100% cotton flannel circular patches