Comprehensive's oxygen free EXF Speaker Cable is specially designed for the most demanding audio applications. EXF means extended frequency response and maximum signal integrity-even over long distances. Our engineers have designed EXF speaker cable for the most discerning ear. Tightly wound, high strand counts of oxygen free copper stranding outperforms traditional speaker cable and will stand up to the scrutiny of true audiophiles. Heavy duty construction allows totally accurate, sparkling signal transfer. EXF speaker cable is perfect for both commercial or home theater applications.