Thomastik-Infeld JR345 Jazz Roundwound Bass Strings (43–118)

The Thomastik-Infeld JR345 Jazz Roundwound Bass Strings are designed to deliver a classic jazz tone with exceptional depth and clarity. With gauges of .043 / .051 / .068 / .089 / .118, these strings feature a nickel alloy winding over a round steel core, providing a smooth, glassy feel and a rich, warm tone. The construction is similar to flatwound strings but with slightly more edge, offering a unique sound that combines the warmth of flatwounds with the brightness of roundwounds. These strings are designed with a lower tension and gauging to increase playability and reduce strain on the instrument's neck without sacrificing output. Ideal for jazz, blues, and classic rock genres, the JR345 offers excellent sustain and a balanced response, making it a favorite among professional bassists.

Key Features

• Gauge: .043 / .051 / .068 / .089 / .118
• Nickel alloy winding over a round steel core
• Lower tension and gauging for increased playability
• Smooth, glassy feel with a warm, organic tone
• Designed to reduce strain on the instrument's neck
• Excellent sustain and balanced response