Non-reactive and non-porous borosilicate glass jars. Safe for high acidity and alkalinity. No Discoloration over time. From fridge, to freezer, to microwave, to dishwasher, this borosilicate jar is truly versatile and durable. Easy-to-remove lids. Easy to monitor ingredient levels. Get organized with these ultra-clear stackable glass jars. Store, sort, stack and display all of your food ingredients in style. Maximize your vertical storage space by mix-and-match different size jars to fit shelves of any height.