Standard threads, Flat top with a pointy button at the top of the pinhole, inner skirt, about the size of a CD 154. Don't know the actual material this is made of but reminds me of the "Mica" beehives. Has nicks flakes and crack lines but is in generally good condition. Left it dirty since I'm not sure how best to clean it. Certainly was used! Kinda heavy so with shipping INCLUDED, we'll go with $25 anywhere in the continental U.S.A. See second pic. NOW $20 Thanks for looking.