Here is a change of pace, a Westinghouse trolley insulator. The top is a metal. The lower half is a composition and the threads are bake-o-lite. Embossed WESTING HOUSE and on the opposite ear 477442. Condition is excellent. Add something different to your collection. Asking $25.00 plus actual shipping cost. Check, money order or PayPal, no fee. Just a note of interest...bake-o-lite was invented (or developed) in 1906.