VFG
Weaponcare Cleaning Pellets 4.5mm

You can keep all rifled and smooth barrels in perfect condition with the VFG quick cleaning pellets. How VFG quick cleaning pellets work: When the weapon is fired, an over pressure occurs that causes the pellet to shrink in length but expand sideways. As a result, it is pressed against the sides of the barrel (and also into the rifling grooves), wiping it and polishing it thoroughly.For Air Rifles and Air Pistols:
It’s simple and quick. You just shoot the pellets. Make sure the pellets are stopped safely into the stop butt or pellet catcher.