The Rotosound SM66 Swing Bass 66 Hybrid (40–100) bass strings are among the most iconic roundwound strings ever made. Built with stainless steel roundwound construction, they deliver a bright, aggressive tone with exceptional clarity, punch, and articulation. The hybrid gauge set offers a balanced feel with fast response, making it ideal for players who want tight lows, cutting mids, and crisp highs that stand out in any mix.

Originally developed in collaboration with legendary bassist John Entwistle, Swing Bass 66 strings helped define the sound of rock bass and have been used by influential players such as Jaco Pastorius, Geddy Lee, and Billy Sheehan. Hand-crafted in the UK and known for their unmistakable bright red silk ends, SM66 strings remain a go-to choice for bassists seeking classic tone, strong output, and the unmistakable bite of stainless steel roundwounds.

MATERIAL

Stainless steel roundwound

GAUGE

40 • 60 • 80 • 100

TONE

BRIGHT

OUTPUT

MEDIUM