Our glass food storage containers are made from borosilicate glass which is more resistant to thermal shock than the more common soda lime glass. They are dishwasher, freezer, microwave and oven safe, up to 400℃. For an added layer of protection, we added a colourful silicone sleeve to reduce the likelihood of shattering when dropped. The airtight and leakproof lids have a silicone seal to lock in freshness, avoid freezer burn and prevent the glass containers from spilling and making a mess in your diaper bag or lunch box. The 5.4oz / 160ml jars are the perfect size for babies starting to eat purees, kids who require an endless assortment of snacks and are also great for salad dressing and snacks for adults. They’re great for meal prep, travel snacks and lunches!