The Micro Bar by MYLÉ is not really their 1st foray in to the disposable market place, plus they've also experienced great achievement with their other starter kits. The Micro Bar cartridge is provided with a small rubber grommet that effectively seals the fill hole, protecting against any unwelcome leaks. https://raymondutxpi.ampedpages.com/micro-bar-dual-an-overview-56331129