Rock Formula

$ 13.00$ 33.00

Deep Mids + Max Output

  • Deep mid-tones with maximum output.
  • Perfect for heavier rock and jazz-rock fusion styles.
  • 52% Nickel alloy wrap wire and specially-tempered tin-plated high carbon steel hex core.
  • Can be order in single sets, 3-packs, or as part of a Mix and Match Multi-Pack.
  • Make your “Gauges” selection from the dropdown list below or: Select from the entire Rock Formula lineup.

Designed, manufactured, and wound in the United States by AmericanString.

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Rock Formula Strings

Rock Formula Strings, the heavy rock and jazz-rock fusion electric guitar string offered in over 10 different gauge choices.

Deep Mids + Max Output

Our Rock Formula string sets deliver deeper mid-tones with maximum output..

High-Quality Materials

We craft the Rock Formula Strings with a specially-tempered tin-plated high-carbon steel.  Our expert string winders use this carbon steel for the plain strings as well as the hex cores.  Additionally, the wrap wire is 52% nickel alloy.

Variety of Gauge Choices

The Rock Formula Strings are offered in over 10 different gauge choices.  Specifically this includes a range from our lightest gauge (.008-.038) up to the “Heavy 11s” (.011-.050).  You can order them in single sets, 3-packs, or as part of a Mix and Match Multi-Pack.

Pure Tone • Great Feel

AmericanString is the premium guitar string brand founded on more than a century of string-making experience.  In addition to guitar strings, we have been the ONLY string maker for Steinway and Sons Pianos (and just about every other fine piano manufacturer) for more than 100 years!  With AmericanString, our sole focus is consistently bringing you the best guitar strings, “Pure Tone • Great Feel.”   We make the finest strings for your guitars by utilizing what no other string maker can, including:

  • 5 Generations of Craftsmanship

    Five generations of expertise, manufacturing processes, and craftsmanship combine to produce the highest-quality strings for your guitars by our craftsmen right here in the United States of America,

  • Our Own Wire Mills

    A string can only be as good as its components.   Therefore, we control the entire manufacturing processes, starting from our own wire mills.  This allows us to provide our string winders with the best component materials available anywhere.

  • Only High-Quality US-Based Steel

    We utilize only the highest quality source metals from US-based mines with whom we have partnered for decades. This reliably provides us and you with superior American steel.

All of these factors combine to consistently produce high-quality long-lasting string sets.  The result is strings sets that deliver superior tone, feel great in your hands, and that perform better than other brands.

Welcome to the AmericanString family!

Additional information

Weight 1 oz
Dimensions 4.25 × 4.25 × .25 in
Single Set or Multi-Pack

Single Set, 3-Pack


8-38, 9-42, 9-46 (9/10 hybrid), 9.5-44 (XL+), 9.5-46 (STMB+), 10-42 (10-9 hybrid), Perfect Tens, 10-46, 10-48 (10-11 hybrid), 11-48, 11-50 (Heavy 11s)

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