Roto Sound Ultramag UM9 (9-42)

With a composition of 52% nickel and 48% iron, this highly magnetic string will certainly accentuate those middles and lows over their steel counterparts. Designed for use in the aerospace industry and high-end electronics, the low co-efficient of expansion will help maintain tuning in wide ranging environments. With its corrosion resistant properties and its unique blend of sound it is truly a string for the discerning player seeking that extra tonal character.