Ernie Ball manufactures the world's #1 selling electric guitar string lines, and distribute in over 110 countries around the world. Played by the likes of Eric Clapton, Metallica, John Mayer, Paul McCartney, Slash, Jimmy Page, Iron Maiden, Blink 182 and Aerosmith ( just to name a few ). Aim of the project was to create a series of vibrant and powerful visuals to give an unique look in the marketplace to their new range of Cobalt products. Ads were published in Guitar World or Guitar Player Magazine. Ernie Ball Cobalt Slinky Guitar Strings are the latest innovation is string technology. Louder than others Cobalt strings provide an extended dynamic range, incredible harmonic response, increased low end, and crisp, clear highs.