Made Almost Unbreakable via the HercuGlass Process: Yet we sell them for about the same price as other sell “ordinary le Parfait. Made in France by an old-time manufacturer. They are high quality and reusable (with a new gasket). PLUS – HercuGlass has made them even better by its proprietary treatment that makes these jars “almost unbreakable”. We use a process almost identical with that use for ultra-high-strength Fighter Aircraft Windshields and the iPHONE cover glass. A great conversation piece -even after the present is open.