BlackHeart Ten Point Carbon Phantom RCX Crossbow String - 35in - BlackHeart crossbow cables are crafted using a blend of modern materials, machinery and time-honored techniques. Featuring DuraWeave construction which process includes pre-stretching the strands resulting in highly consistent cable length. Each cable is meticulously hand crafted to fit your crossbow. GlideLock Center Serving Duraweave Pre-Stretched For Tenpoint Crossbows