What kind of wood is the 200-pound yoke that holds the 2080 pound bell that is on display at 520 Chestnut Street in Philadelphia?

The kind of wood used in the 200-pound yoke that holds the 2080 pound bell that is at 520 Chestnut Street in Philadelphia is a n American elm. It also known as Ulmus Americana. This is the largest and most widespread elm in the United States. Hope this answers the question.