Girl Scout Cookies CO2 concentrate extract by TOP GUN MEDS. This refill clocks in at 34.5% THC. It is 0.5g of product. The cartridge is used with a battery pen that vaporizes the concentrate in the cartridge. CO2 extracts are arguably the most efficient, healthiest, and best way to taste your favorite flower. This is made possible by the extraction process that uses CO2. The CO2 evaporates leaving behind all of the THC as well as all of the natural compounds that give your herb its unique scent. THANK YOU CHEMISTRY!!!