Duralex Made In France Ovenchef Glass Rectangular Bakers, Set of 2 Set includes 13 x 7.75 inch and 15 x 9 inch glass rectangular bakers Manufactured to withstand sudden temperature extremes from -4F to 266F and is suitable for hot or cold liquids Duralex tempered glass is 2.5 times stronger than ordinary glass; Glassware can go directly from the freezer to the microwave If broken by strong shock, Duralex shatters into small pieces, reducing the risk of injury Duralex glasses and bowls are stackable for convenient and space saving storage