Experience. But of course, darling it"s best experienced with teaposy glassware. The art plus craft of tea. A singular moment. For teaposy plus loose leaf tea. Handmade, heat-resistance borosilicate glass; safe from -4 deg. F. to 300 deg. F. Contains 20% recycled material. A little loose leaf tea filter - genius. This product is hand made in China.