Mason Glass Jars We adhere to product-oriented, ensure high quality, use safer materials, and make every product carefully. Material — Made of high-quality food-grade glass, BPA-free, 100% recyclable, non-toxic, and preservative. Safe and easy to clean — Glass replacement jars are dishwasher safe, so they can be put into the oven and freezer, safe and healthy. Reusable glass jars — …