GHS PRDM Progressives Dave Mustaine Roundwound Electric Guitar Strings Gauges: 10-13-17-30-44-52 A Magnetically active "Filament Grade Alloy" surrounding a premium core wire produces a long lasting and powerful combination Progressives will magnify any playing style A Magnetically active "Filament Grade Alloy" surrounding a premium core wire produces a long lasting and powerful combination Progressives will magnify any playing style