For shooters looking to step up their PCP shooting game” the Umarex Brimstone .22 caliber slug delivers hard hitting” accurate airgun performance. The Brimstone .22 caliber slugs come in at 28.24 grains in weight and a consistent .2175 diameter. The Umarex Brimstone .22 caliber slugs are hollowpoint in design for maximum expansion and come in a tin with a screw-type lid to help prevent accidental spills.