Roundwound Nickel-Plated Steel Boomers with reinforced plain strings to help withstand the extra stress put on by certain types of playing styles and tremolo systems. 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: T-010; T-013; T-017; DY26; DY36; DY46