Our pint-size PLASTIC mason jars are fun and useful. They are made in the classic mason jar square shape and fully compatible with regular mouth mason jar lids (plastic or metal). However, they are made of lightweight, shatterproof plastic which is very convenient for gifting, mailing, freezer storage, and on the go. We include one-piece metal mason jar lids for that classic mason jar look. Think of all the uses such as: Gift baking mixes Art & craft projects Freezer and fridge storage Pantry storage Spice jars (great two-cup capacity for your favorites) Smoothies, yogurt, and overnight oats Storing bulk foods, pantry storage Snacks and portion control Storage of homemade peanut butter, nut butters, etc.