RotoSound
不銹鋼弦線採用了有專利的linea pressure-wound技術，而此技術能加強中頻，令弦線有獨特的音色。另一個特別的纏繞方法能減少手指與弦線間的磨擦，從而增加彈奏速度和減少雜音。
特別適用於Fretless 低音結他
弦徑:
SM55 (40-100)
RS55LD (45-105)
 
Stainless Steel with patented linea pressure-wound finish. The linea effect accentuates the middle frequencies in resulting in a tone quite different from a normal round-wound string. 
Special rolling technique can reduces finger noise and friction thus allowing for more rapid finger movement.
Great for using on fretless bass guitar.
Gauge:
SM55 (40-100)
RS55LD (45-105)