Very tough porcelain. Almost perfect less a shallow flake on the inside of the "wire groove". You can see it in the photo, it is a white patch. The condition of this one should be regarded as next to exceptional as most have a bit more damage. $295 plus actual shipping. First e-mail gets it. I guarantee all insulators I sell. If you don't like it simply return it for refund (less shipping). Great shape and will be a very difficult upgrade!