Lo-Tune Boomers have larger than usual cores to control vibration. 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 continues to be THE power string. GHS strings are the music industry"s choice whether you want a fat, bright tone, or a bluesy, warm & mellow tone. Before they leave the shop, each string is meticulously inspected by hand by quality assurance people. Gauges: .011; .015; .019; .DY33; .DY43; .DY53