The Borosil glass jars are made from borosilicate, which is a food-safe material. It does not leach any chemicals or toxins into the food when exposed to high temperatures. Also it does not retain any odour or stains of the food items previously stored. Thus, these are safe for use and are completely toxin free. You can use these to store sauces and chutneys and also as tea, coffee, or sugar jars.