GHS REINFORCED BOOMERS - ELECTRIC GUITAR STRINGS. We reinforce the plain strings by wrapping a layer of silk around the end, to help withstand any extra stress you throw at them! GHS Reinforced Boomers are ideal for all guitars with or without tremolo systems. They can be used with other standard trem - and non-trem - guitars for additional stability and durability. 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 our Anti-Corrosion ), ensuring they're as fresh as the day we wound them at our factory in Battle Creek, MI. That's what we mean when we say "Play with the Best; Play GHS."