From OXO, these baby blocks feature: To make meal and snack time easier for you, we created our six-ounce OXO Tot Baby Blocks. They've got measurement markings on the side (so you know how much you're doling out), have easy-to-open airtight and leakproof lids and they can go anywhere (we're talking parks, restaurants, even the fridge, freezer, microwave and dishwasher). In case you needed more proof that we really did think of everything: The BPA-free containers come with a stackable tray to keep them neat and organized on your shelves. Includes: 1 tray, 4 baby block, and 4 leakproof lids 6oz. dishwasher safe Imported.