The 473-ml glass bottle with special Neck is a flint (clear), high-quality, food-grade certified, FSSC 22,000 certified, 100% non-toxic, 100% lead free, and microwave and dishwasher safe. The glass bottle is chemically inert and unreactive and does not leach chemicals into your product. The glass bottle is used to pack and store ketchup and sauces, oils, vinegar, etc.