The Byrna 8 Gram CO2 Cartridges with Oiler is custom fit for the Byrna SD, EP and HD Launchers. Now including 1 CO2 cylinder with oil for simple maintenance every 10 CO2 cylinders used. It is recommended to keep an unpunctured cylinder in your launcher at all times for self-defense purposes. Punctured cylinders within your Byrna Launcher will leak over time. Note: Not compatible with Byrna LE, SDXL, HDXL or Launchers with Byrna Boost Installed