Solid Brass material for this item. This is a quality and effective product. Complete Your Nautical or Maritime Collection This display boatswain whistle is made of brass and copper. The whistle is attached to a chain 15.5"and whistle is about 4.8" in length. This whistle is meant to be a display item. It does not function as a true boatswain whistle. It will make a great collector's piece.