BPA Free & Food Safe - the glass jars are made of high quality thick glass which is Non-toxic. Leak Proof and Airtight - each small glass jars has a plastic lid so they are also ideal for storing food. Oven, Microwave and Dishwasher Safe - you can directly put these glass jar into microwave, but please remove the plastic lid first. Easy to Clean- wider opening mouth design, easy to use, clean and dry. Multiple Uses - suitable for homemade yogurt, milk, parfait, pudding, jello, jam, honey, desserts and so on.