The Slinky Paradigm range of strings, the latest technological innovation from American Ernie Ball, offers longer life and brilliant sound. The toughest strings in the world. Paradigm strings are the toughest on the planet, so tough that ErnieBall guarantees them for 90 days. Thanks to a Plasma treatment process that removes defects and improves corrosion resistance, Paradigm strings will stand up to the toughest playing styles and most extreme conditions.