composition... think baby bat ears only a lot smaller 2 7/8 inches tall X 3 3/4 inches in diameter. It has a threaded brass sleeve in the pin hole. There is a little edge chipping. It was certainly used. The seller thought it may have come from a RR line in Hillsdale, Michigan. It was it in a rusty coffee can just miles from my house at a garage sale. The mica pony was also bought there.