Corelle Dinnerware plates and Bowls were first introduced in 1970. It was the original break and chip resistant glass dinnerware. Corelle dinnerware is made through a hub lamination process that thermally bonds 3 layers of glass. A core glass in the middle, with top & bottom layers of a very clear skin, or glaze glass. This process offers these unique features and benefits; 1. Chip & break resistance, 2. A lightweight and stackable product. 3. Easy to clean and dishwasher safe. 4. oven and microwave safe. 5. spot and fade resistant under normal use.