Blackheart Crossbow String 39 1/2 in. Covert CX 1. These bowstrings feature GlideLock center serving which enhances durability reduces friction reduces serving separation and almost eliminates the ridges between the serving strands. The DuraWeave process includes pre-stretching the strands resulting in highly consistent string length. Each string is meticulously hand crafted to fit your crossbow. 26.125 for Excalibur Micro 335 Micro 335 Nightmare. Package Contents: Blackheart Crossbow String BlackHeart crossbow strings are crafted using the right blend of modern materials machinery and time-honored techniques. These bowstrings feature GlideLock center serving which enhances durability reduces friction reduces serving separation and almost eliminates the ridges between the serving strands. The DuraWeave process includes pre-stretching the strands resulting in highly consistent string length. Each string is meticulously hand crafted to fit your crossbow.