Our Tellfresh® Food Storage collection features easy to use, airtight lids and traditional good looks. Each piece is safe for the freezer, refrigerator, dishwasher, and reheating in the microwave. There are graduated metric measurements molded into the bases. They're amazingly affordable for food storage of this quality. Designed exclusively for use with our Tellfresh® Food Storage containers, our ingenious Tellfresh® Tags (sold separately, listed below) clip into the side of the container to take the guesswork out of what's inside and how long it's been there.