Progressives Roundwound Alloy 52 are an extremely bright and durable string. The magnetically active “Filament Grade Alloy†combined with a well-studied core-to-cover ratio produces a long lasting powerful brilliant tone. Progressives will magnify any playing style.Available GaugesPRM - 11, 15, 18, 26w, 36w, 50w (Medium Gauge)PRDM - 10, 13, 17. 30w, 44w, 52w (Dave Mustaine Signature Set)