Gutiar Strings. Made by GHS.3 sets of Roundwound Nickel-Plated Steel Passion, Power and Performance. The Dynamite Alloy Boomers continue to be the standard to play by. The bright, long-lasting tone makes the Boomers an extremely popular brand by all types of guitar players. Exrta Light Gauges: 010/013/018/026/036/046