The durable glass is thick and has a fluted. The glass bowls can be used in microwaves, dish washer, refrigerators, freezers, and ovens. The bowls are perfect and so versatile. Each bowl also has a plastic lid that has a rubber seal to ensure its airtight. The lids have 4 latches, one on each side.
The bowls also stack, there are 3 different shapes, round square and rectangle. There are 3 stacks of bowls. I like how the glass looks high quality and love that I can use in the oven. The bowls I got are a variety of sizes and perfect for a 1–2-person household.