High quality vacuum glass liner with excellent temperature retention; heat 151°f @ 10 hrs. / 124°F @ 24 hrs. , cold 46°f @ 10 hrs. Vacuum liner made of Japan premium, medical-grade*-equivalent borosilicate glass (tested by a third-party laboratory and rated EP/USP Type I, which is the same as medical grade glass); stain and odor resistant glass interior Accommodates most direct brewing attachments Unique decagonal design, ideal for home or office use Easy-to-use large push button stopper with a durable and sturdy handle for easy serving