The 25 gm Glass Jar with 25 mm ROPP Neck is square-shaped, flint (clear), high-quality, food-grade certified, FSSC 22,000 certified, 100% non-toxic, 100% lead free, and microwave and dishwasher safe. The glass jar is chemically inert and unreactive and does not leach chemicals into your product. The glass jar is used to pack and store honey.