Since 1975, GHS Guitar Boomers have been THE POWER STRING, and continue to set the standard for musicians in nearly every genre of music. Nickel-plated steel wound over a round core brings a bright tone with a powerful attack, that lasts for an extended period of time. Each string is individually sealed in the GHS Nitro-Pack envelope (with Anti-Corrosion Guarantee), ensuring they’re as fresh as the day we wound them at the factory in Battle Creek, MI.