The Medium Nickel Dimebag Darrell signature Hi-Voltage electric guitar strings stay in tune and remain bright and fresh for a long time. DR Hi-Voltages are made for string bends whammy-bar dives harmonic screams and chunky riffs. I ve been playin the strings of strength since 1995. I like the way DR Strings feel and react you can really get a grip on them. They re great for everything from big ol string bends to huge whammy bar dives perfect for blood curdling harmonic screams and just straight out heavy chunky riffin . They also stay in perfect tune and remain fresh and bright for an amazingly long time said Dimebag. Gauges 9-11-16-26-36-46.