The Slinky Cobalt range of strings boasts the same exacting standards as the American firm's famous Slinky strings, while offering powerful sound and impeccable clarity. Technology at the service of sound. The Slinky Cobalt range is the latest technological innovation from the American firm: cobalt is known to produce a magnetic attraction that maximizes output while delivering a wide dynamic range, incredible harmonics, deep bass and crystal-clear treble. What's more, these strings offer a silky-smooth feel that makes bending much easier.