Made of Borosilicate Glass - just like vintage PYREX
Thermal Shock Resistant
Scratch and Stain Resistant
Just like the Corning made PYREX of yesteryear this French made PYREX Ramekin is made of laboratory grade borosilicate glass to resist Thermal Shockcaused by rapid changes in heat or cold. This borosilicate glass cookware will last for decades to come.