Part of the innovative Ultramag series, the Rotosound UM10 electric guitar strings are made from a special 52 Alloy that reduces emphasis on the higher frequencies, improves tuning stability due to a lower expansion co-efficiency, and is ultra-resistant to corrosion. The 53% nickel and 48% steel alloy boasts increased magnetic sensitivity that works in combination with the core of your pickups to result in enhanced lower and mid-range frequencies. This pack includes gauges .010 to .046.