Early this year Ernie Ball released a unique line of electric guitar and bass strings. Known as Cobalt Slinkys. The proprietary cobalt steel wrap on the wound strings is said to be provide a "stronger magnetic relationship between the strings and the pickups", resulting in higher output, more sustain, and richer harmonics. The initial response was so strong that Ernie Ball were left scrambling to keep pace with the demand. I recently got my hands on a set and put them through their paces.