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.