Blackheart Crossbow String Black. 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. Specifications for Blackheart Crossbow String 81295: Manufacturer: Blackheart Color: Black Features of Blackheart Crossbow String: GlideLock Center Serving Duraweave Pre-Stretched Package Contents: Blackheart Crossbow String Blackheart 81295: Crossbow String 81295 Black