The ceramic Middle rod is produced from a porous white glazed ceramic. A plastic ring created from polypropene sits below the tank. There is certainly an o-ring made from a silica gel compound that helps seal the ceramic rod to the plastic ring at The bottom in the cartridge. https://buy-vape-carts-420-review19528.kylieblog.com/27238269/the-5-second-trick-for-marijuana-edibles-in-virginia