Thomastik-Infeld Jazz Swing Flatwound JS112 (12-50) Guitar Strings

The Thomastik-Infeld Jazz Swing JS112 is a premium flatwound string set designed specifically for jazz guitars, archtops, and semi-hollow electrics. With gauges .012 / .016 / .020w / .027 / .037 / .050, this “medium-light” set delivers warm, smooth tone and refined articulation.

Crafted in Vienna, the strings feature a polished nickel flat-wound wrap over a round steel core, yielding a glassy feel and a rich balance of fundamentals and overtones.
Ideal for the jazz player seeking vintage vibe, enduring performance, and a silky-smooth playing surface. Used by professionals who want clarity in clean jazz settings yet the warmth and sustain of a traditional archtop.

Whether you’re recording a trio, playing straight-ahead jazz or comping in a club setting, the JS112 offers enduring tone, comfortable feel, and superb longevity.

Key Features

• Gauge: .012 / .016 / .020w / .027 / .037 / .050
• Flat­‐wound nickel over round core for smoothness and clarity
• Mellow timbre, yet powerful and articulate — especially suited to jazz
• Long string life thanks to high quality materials and precision craftsmanship
• Ideal for archtop, hollow-body and semi-hollow instruments