Glass food storage containers with snap lids. To accommodate all of your baking and storage needs, borosilicate glass can handle temperatures of up to +560℃/ +1040℉and down to-40℃/ -40℉. Can with stand temperature changes of up to 120℃/248℉ with ease. Heavy duty, pro grade snap down levers that provide air-tight and water- tight storage . Features a removable silicone ring to guarantee a secure fit and to make cleaning easier . These BPA free，non-toxic lids are freezer, microwave, andtop-rack dishwashers afe.