This is a Corning Corelle Forever Yours pattern A-21-B-11 lasagna long rectangle baking dish casserole. It is 12 1/4" x 10 1/2" x 2 1/2." It is in excellent condition with no chips or cracks. Corning/Corelle produced Forever Yours from 1988-1994. Please see my other items for more in this pattern.