Borosil

Unique seal is perfectly air tight to keep food fresh
Borosilicate glass makes it safe for use in microwave and conventional ovens, and also in freezers and refrigerators
Highest quality glass and technology makes it explosion proof and safe for use ; Do not use over direct flame ; Do not allow the food to dry completely in the oven ; Do not put the hot dish on cold or wet surface ; Do not use abrasive cleaners or scourers to ensure scratch free surface