Kluson USA? Aluminum, Brass, Steel, Or Zinc Stop Tailpiece With Steel StudsThe Kluson USA? vintage stop-bar tailpiece is a high-quality tailpiece that is very hard to distinguish from the originals of the 50's and 60's. Made in America with a 5-step plating process. Made from aluminum, bell brass, steel or zinc. Includes 5/16-24 steel studs.