Shanghai wm offers timeless design and superior durability on a wide variety of glass bakeware and food storage items.glass is a heathier choice over plastic storage.glass does not discolor, retain smells, or leach chemicals into food. Trueseal glass food storage products are designed with an airtight seal lid to keep foods fresh longer and enable leak-free storage and transportation. Glass food storage is microwave, pre-heated oven, refrigerator, freezer, and dishwasher safe and is tempered for maximum durability. True seal lid are bpa-free and top rack dishwarshers safe, unique, over-molded lid design allows for easy cleaning and reduce the risk of trapped food and bacteria. Lid open easily and feature a transparent window for evsy viewing. These conveniently size dishes are idea for transporting to and from work or school with your favorite soup.