GLASS FOOD CONTAINERSHigh quality, food safe glass food containers. Made of borosilicate glass (which has the ability to go straight from the freezer to the oven without cracking!)Heavy duty rubber clips and leak proof silicone seals. Perfect for packing a lunch, baking individual meals or storing leftovers. The uses are endless.BOROSILICATE GLASSFREEZER SAFEMICROWAVE & OVEN SAFE (up to 400ºF/204ºC without lid)DISHWASHER SAFE!