OXO Tot Glass Baby Blocks Food Storage Containers Aqua, 4 oz. Portion, Store, Heat and Serve baby food in one convenient container with the Tot Glass Baby Blocks. These are made of durable borosilicate glass, which is thermal shock resistant. This means they can go directly from the freezer to the oven or microwave, no need to wait until your little one's meal is fully defrosted before heating it up. The easy-to-use SNAP storage lids are leak proof to keep food fresh and minimize mess, even when on the go. The stackable trays make for easy storage in the refrigerator, freezer or just your cabinet. Condition is used with no chips or cracks- looks brand new!!!