These are really nice glass food storage containers. The glass is a nice heavy weight with a substantial rim all around. The lids snap on tightly and the box indicates that the glass is  dishwasher, freezer, oven and microwave safe. I do wish that the glass had these qualities imprinted into the bottom of each container the way other glassware does so that i can tell just by checking if it is oven safe etc.
Overall very happy with these so far