It is illegal to carry a slungshot.

The Law Explained

Not to be confused with a child's toy slingshot, a 'slungshot' is a maritime tool made of a heavy weight tied to a flexible cord, which became notoriously popular as a concealed weapon for street gangs in the 19th century. Delaware, along with many other states, explicitly banned the carrying or manufacturing of this specific weapon to crack down on waterfront brawls and muggings.