BowTech String and Cable Set for a Bowtech Invasion. It's a well-known fact that strings and cables are critical in overall bow performance, so we produce the most respected and reliable strings available. Octane strings are hand built to ensure that our high demand for quality is upheld. Over the last ten years, Octane has designed and built custom machines that are proprietary to the Octane string building process. The combination of hand quality and custom precision machinery allows for only one result; Perfection. This String Can Be Special Ordered for you in any COLOR! Please call to place special orders.