This maintenance capsule needed used capsules with normal CO2 for CO2 pistols, revolvers and other weapons. To "smear" these weapons properly, these capsules are required. They contain 0.5 g. Of a special oil. When wandering of this capsule, the valve of the weapon is not only cleaned and lubricated, but also provided all the moving parts of the mechanism with an oil film. After 10 faded 12g. CO2 capsules should be used 1 maintenance capsule. These are offered favorable. Strong buy recommendation !!!!!!!!!!!!!!!