Lock&Lock Boroseal, Borosilicate Glass, 10-Piece Set/5-Containers Includes a LLG431 (3.1-cup), a LLG441 (3.7-cup), and a LLG451 (7-cup), and 2 of LLG421 (1.5-cup) Excellent airtightness with the 4-side locking system keeps food fresh Heat-resistant glass can withstand sudden change in temperature Resists stains and odors for lifetime of clarity Safe for use in microwave and oven (without lid), freezer, refrigerator, and dishwasher