This is a vintage set of four CorningWare casserole pans with lids. The pans are made of ceramic with a glossy surface coating and feature a blue cornflower pattern. They were manufactured between 1961-1966 in the United States using the production style of Pyroceran. The set includes two P-1-B pans, one P-1 1/2-B pan, and one P-7-B pan, all of which are oven-safe and can be used with electric, gas, or microwave ovens.