Abstract: The present invention discloses a cartridge sleeve configured to provide a better grip on a glass cylinder of a cartridge. The sleeve provides adequate protection to the glass cylinder from breaking if accidentally dropped or strikes on a hard surface. The sleeve is sized to stretch for inserting over the glass cylinder of the cartridge and provides securely grip during use. The sleeve could easily be removed and inserted to the replacement cartridges. The sleeve is configured to suitable for different sizes of cartridges. The sleeve comprises a plurality of slots and is molded into the body of the sleeve. The slots are configured to allow the user to check the substance or fluid level within the glass cylinder of the cartridge. The sleeve also conceals or disguises the substances and allowing more discreet use of substances. The cartridge is connected to a battery via a threading means.