This Mid Century flying saucer style ceiling or lamp shade is designed to clip onto the light bulb. Made of clear and white bumpy molded fiberglass, it has a pebbled or popcorn texture similar to the old sprayed ceilings (not the same material however - there's no asbestos in the shade). It measures 11-3/4 inches diameter. The shade has one small shallow flaw on the rim (last photo), barely noticeable. There is no other damage, stains, or discoloration.