HIGH QUALITY BOROSILICATE GLASS:Our glass storage containers are made from high quality borosilicate glass, Which is stronger and can hold up to temperature changes much better than cheaper glass food storage containers. AIRTIGHT SMART-LOCKING LIDS: MCIRCO Glass food storage containers use snap lock lids that with silicone seals to ensure your meal prep food will last much longer than normal plastic food storage containers or Tupperware sets. These lids are easy to use and will stop leaking. These lids will not break or slowly stop working. PERFECT SIZE AND GOOD VALUE: 22oz, 6.2"x4.5"x2.2",,Set of 10,It is Perfect for meal prepping.Staying healthy and saving time by cooking and freezing your meals for later. FDA CERTIFIED FOOD GRADE SAFE & BPA FREE: Easy to use and easy to take care of, microwave safe, freezer safe, dishwasher safe, and oven safe for over 500 degrees Fahrenheit. Take off the lids before going to dishwasher, oven and microwave for better maintenance.