Tired of getting splatter with cleaning solvent and residue when cleaning your barrel? These handy Birchwood Barrel Boss Residue Collector bags are closed on one end and have an elastic band on the other to fit over all types of firearm barrels. Place a second bag with small slit hole on breech end for splatter-free brush removal. Catch the splatter in the bags – not on you! Birchwood Barrel Boss Residue Collector bags are solvent-proof and disposable.