Rotosound Swing Bass 66 RS66LF Bass Strings – Stainless Steel 45-105 Long Scale Set (39406)

The Rotosound Swing Bass 66 RS66LF is the world’s most famous roundwound bass string set. Gauged .045–.105 and designed for long scale bass guitars, this stainless steel set delivers the iconic bright, punchy tone that has defined rock bass since the 1960s. Favoured by bass legends including John Entwistle, Geddy Lee, John Paul Jones, and Billy Sheehan, Swing Bass 66 strings continue to be the industry standard for players seeking power, clarity, and durability.

Key Features

• Gauge .045–.105 – custom gauge set for long scale bass guitars.

• Stainless steel roundwound – delivers bright, punchy, high-energy tone.

• Iconic heritage – the original roundwound bass string, introduced in 1962.

• Endorsed by legends – used by Entwistle, Sheehan, Jones, Lee, and more.

• Durable construction – designed for consistent performance and longevity.

• Made in the UK – by Rotosound, a world leader in bass string innovation.

Why Choose Swing Bass 66?

Developed in collaboration with The Who’s John Entwistle in 1966, Swing Bass 66 strings solved bassists’ long-standing problems with sustain and response. By refining the core and winding design, Rotosound created strings that vibrated properly, producing the punch and clarity that reshaped modern bass playing. Today, these strings remain the go-to choice for rock, metal, funk, and beyond, making them one of the most versatile bass string sets available.

Specifications