4 OZ CAPACITY JARS WITH MEASUREMENT MARKINGS - Our 4oz containers with lids allow you to prepare the perfect amount of food for your little ones. No more food waste! It also allows you to reduce your use of disposable containers. HIGH GRADE FOOD-GRADE GLASS - Ergonomic design allows for better handling. Dropping baby food storage jars are not only scary when they’re glass, but also wasteful and frustrating. ALL NATURAL & NON-POROUS - Glass is an excellent alternative to plastic containers. Unlike plastic, our glass baby food jars only contain food grade materials with no harmful extras. And because our glass baby food jars are non-porous, they won’t absorb food, liquids, or other potentially harmful extras! AIRTIGHT LIDS LOCK IN FRESHNESS - Airtight, twist-on lids ensure that your carefully-concocted meals will stay fresh and delicious. No freezer burn and no stale munchies! MICROWAVE, FREEZER, & DISHWASHER FRIENDLY - To warm food, just place in the microwave--just don't forget to remove the lid! Chill fruit mash in the freezer for a refreshing treat. To wash, simply put it in the dishwasher.