Pro-co black jack 應該是樂器用的線....

原廠的說明是這樣的:


If you’re in need of an elegant, great-sounding instrument cable that will last a lifetime, Black Jack is the one! Kevlar reinforced for unmatched strength and dependability, Black Jacks are low inductance, ultra-flexible cables which provide tight bass, unmasked midrange and clean, open highs. Unlike highly-resistive steel inserts and tubing in other products, Black Jacks feature custom G&H connectors with gold plated, machined brass components and an oxygen free copper center conductor which will never break off.