Fusion Wound technology utilizes electricity to fuse the Phosphor Bronze cover wrap more tightly to the core of the string. The process, which is exclusive to S.I.T. Strings, eliminates loose spots in the winding. Loose spots in the winding can cause a "dead sounding string" or a string with Fusion Wound Technology, the final result is an acoustic string with a truly unique sound and feel. This process is also available on S.I.T.'s Rock Bright line of bass strings.