Amazon.com: The String Cleaner by ToneGear : Musical Instruments
Guitar String Gunk
Microscope World Blog: String under the Microscope
I got to use an electron microscope last week - Album on Imgur
Elixir Guitar Strings – No More Rust, Less Hassle! – Guitar Fact
Ultimate Guide to Guitar Strings: Gauges, Metals, Coatings, and More - Guitar Gear Finder
100-Year-Old Guitar Mandolin String Under a Microscope! - YouTube
microscopic images.'s tweet - "guitar strings magnified 200x under an electron microscope. the nickel coils are wrapped around a steel core, the size of which affects the tone of the string. " -