Rotosound Ultramag 09-42 Type 52 Alloy Electric Guitar Strings UM9 Flatwound The Spectrum Bronze strings are

The Spectrum Bronze strings are specially designed for the demands of professional recording

Code: MA550FX

Ernie Ball Earthwood 80/20 Bronze Acoustic Guitar Strings are made from 80% copper

Code: BSIN10R

Rotosound Ultramag 09-42 Type 52 Alloy Electric Guitar Strings UM9 Flatwound The Spectrum Bronze strings areRotosound Ultramag Electric Guitar Strings Gauge: 09 42 Finish: Alloy 52 Guitar: Electric 6 String Gauges . 009 . 011 . 016 . 024 . 032 . 042 Code: UM9 High energy at your fingertips! Our new Ultramag strings are made with type 52 alloy a highly magnetic material made from 52% nickel and 48% iron. This blend gives Ultramag strings more power, sustain, and a longer string life than traditional nickel or steel strings.