CorningWare Ryku 3-Quart Square Casserole The square Ryku bakeware design captures the essence of trend and brings a unique simplicity and symmetry to the kitchen and dining environment. Two-tone glaze, textured matte finish on the outside for aesthetics, high gloss glaze on the inside for easy clean surface. Dual purpose bakeware and serveware goes easily from oven to table Oven, Microwave, Refrigerator/Freezer, Dishwasher safe Extended handle design allows for easy handling