CO2 quality is critically important for the health of your air gun. Without clean, reliable power, valves clog, O-rings and seals deteriorate, and over time your air gun will break down. Any CO2 can meet the standards of size and weight, but Umarex adds their own standards to ensure clean power. Where top seal designs vary with other manufacturers, Umarex ensures there are no out-of-spec cartidges to damage your gun s puncture assembly. Ensure a lifetime of performance with tested and proven clean CO2.