This is a vintage PYREX A12C Domed Glass Lid designed for a 10" square casserole dish. The lid is clear and made of glass, with a glossy finish. It is an original piece without packaging, weighing 2 pounds and 7.9 ounces. The lid measures 3" in height and 10 3/8" square from edge to edge, fitting the corresponding casserole dish. It is a unique and collectible item for those who appreciate vintage PYREX kitchenware.