About this item These containers are made of High Borosilicate glass which makes it safe for use in microwave and conventional ovens. And also in freezers and refrigerators. Freedom of carrying liquid dishes as the containers are leak proof. Glass containers are 100% food safe, it doesn't leach potentially harmful chemical unlike the other materials and are 100% BPA free. Due to its non-porous nature, it doesn't absorb food & food smell, stains or germs, making them very easy to clean. The best part is it’s retain crystal clarity even after repeated use and Safe to use in freezers & refrigerators.