The jar is sealed with a thin removable silicon gasket to keep it shut tight for safe storage. Bodums traditional borosilicate glass contains no lead and has a brilliance like no other industrial manufactured glass. The ultimate storage jar, it absorbs no aromas, and once cleaned in the dishwasher all scents of an earlier stored tea, coffee, or herb will disappear.At Bodum a jar is not just a jar... but common sense and practical knowledge