SUPERIOR GLASS TECHNOLOGY These premium highquality food jars are made of 100 recyclable borosilicate glass which is 2 to 3 times stronger than regular glass FREEZER OVEN MICROWAVE STERILIZER DISHWASHER SAFE Store freeze and reheat indefinitely They are built to withstand high temperatures and thermal shocks safe for storage in a refrigerator freezer or to be reheated in the microwave or oven AIRTIGHT SILICONE SEAL KEEPS FOOD FRESH Leakproof silicone lids and 100 airtight seal prevent messes while keeping food fresh STAIN RESISTANT GRADUATION MARKINGS Convenient these clear glass containers are stain resistant and feature graduation marks to portion the food precisely DURABLE AND RECYCLABLE Made from borosilicate glass an environmentally friendly hardwearing and 100 recyclable material means they can be used for longer Certified BPA lead and phthalate free