3 piece rectangular cooking/storage containers includes 3 Patented plastic Microwavable Lids. Resistant to -40°F /+572°F, stands up to daily use and extreme thermal shock (400°F), going from the freezer directly into the oven (without lid) to serve up delicious recipes. Optimized meal prep solution and perfect organization in your kitchens. Extra resistant tempered borosilicate glass stands up to daily use and extreme thermal shock. Microwave safe lid - Patented lid with two steam valves for reheating , easy to handle: sliding fixtures to release steam. Airtight, BPA Free. Lid suitable for fridge, freezer and dishwasher use. Lid not suitable for use in the oven. High quality glass, made in France, with a 10 year guarantee.