The Ernie Ball Electric Guitar String Tone Pack is the perfect way to experience three legendary electric guitar tones. From the world’s #1-selling Original Slinky strings, featuring classic, balanced tone, or the Cobalt Slinky Strings, providing higher output and superior clarity, to the M-Steel Slinky strings, which are the loudest, most expressive strings ever created. Three tones. One Pack. Famously Slinky.