Rock TONE Round Wound Nickel Electric Guitar Strings, 009.042 Light 8% Nickel with an exceptional combination of metal alloys for superior sustain The unique combination of metals helps produce a loud vibrant sound better than ordinary steel guitar strings Nickel guitar strings are renowned because of their non-corrosive nature and harmonious, sustaining string notes Has the best strings with the most accurate intonations you could ask from an electric guitar; made in the USA using custom machines Pure Stainless Steel: .009, .011, .016, Wound Nickel: .024, .032, .042