This is a double "dead end bell" type insulator that we got form my Dad's neighbor who is a local lineman. He's been saving some stuff for us that he used to just throw out. These have a real nice looking green tint to them. He also gave us a triple "dead end bell" in an aqua tint (never been used!). He just took off to work in L.A. for a month and said he will be on the lookout for more glass! :o)