Product Description From the Swing Bass 66 range, this is Billy’s custom signature set using his preferred 43-110 gauges. The most popular Roundwound bass string ever. Rotosound was the first string company to produce this kind of string. Introduced in 1962 it changed the sound of the instrument instantly. The favourite string of many players including Billy Sheehan, John Paul Jones and Geddy Lee. Available in all popular gauges and scale lengths. The steel used to produce these strings is unique, combined with a highly secretive manufacturing process. From the Manufacturer These strings, custom gauged by Billy Sheehan, provide the time tested Rotosound Swing Bass 66 standard set with two special advantages: A slightly lighter G provides a more even string to string tension across the neck and makes bending easier. A heavier E string makes for a tighter low end with increased mass for more volume in the lower register. The 0.110″ gauge also facilitates tuning down to a low ‘D’ without the string bottoming out or loss of intonation.