.012"DIA TOPAS H.E.A.T. WIRE, 44LBS is manufactured in Germany by bedra and sold exclusively by Single Source Technologies. It features a CuZn20 (80% copper, 20% zinc) core with a zinc-rich brass double-layer coating and is highly suitable on a variety of EDM machines. Its brass core allows for higher cutting power and speed and the double-layer coating can help prevent wire breaks.