From 1964 to now, the GHS Boomers series has been the flagship set of GHS Strings. Used by musicians in every genre, the Boomers have shown to stand up to any playing style. Now known as "The Power String", GHS Boomers continue to make their mark on music across the world. The roundwound guitar set is made with Nickel-Plated steel wrapped tightly around a round core wire. The combination provides the string with its bright characteristic and long-lasting tone.