These are thick glass. I have been using them for months. Glass hasn't chipped, dishwater safe, and the tops have retained there shape and suction. Works perfect.
I thought they were a bit bigger, but I like the different sizes. The top is not as sturdy as I like and when I try and pour little cereal pieces out they get stuck
I LOVE THIS TRAY. I MAKE DEVILED EGGS ALL THE TIME AND I NEVER HAVE A GOOD PLATE FOR THEM WHERE THEY DON'T SLIP AND SLIDE ALL OVER THE PLACE. THE OTHER GOOD THING IS THAT THERE IS A TOP TO COVER THEM AND YOU CAN CARRY THEM TO A PARTY.
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