Clear glass insulators of the type found on telephone poles. They’re all the rage at the flea markets, ranging up to $10 in our area. Ours however, are unused and manufactured sometime in the last 20 years. 2–7/8" max dia. by 4" high. Each one weighs a pound, so we’re talking serious glass. Fine for rare antique scams, paperweights, chessboard pawns, salt & pepper shakers (alterations required or the stuff stays on the tablecloth!)or cocktail glasses for guests who have the habit of setting drinks down only to forget where. They’ll either hang onto these or have no difficulty finding the spill!!