Cryogenically frozen for amazing tone, sustain, and endurance.ÿBe chill.By now you probably know that Dean Markleys ingenious Blue Steel strings are cryogenically frozen with a blast of liquid nitrogen!But why would they do such a thing? By freezing them down to -320.F, this tightens the molecules, minimizing microscopic gaps. This process removes transient frequencies that produce harsh highs and muddy lows, creating a more consistent string, with true tone and longer life. A method to the madness!Made of 8% nickel-plated steel outer wrap on tinned Mandolin wire hex-core, Dean Markley Blue Steels have been top-sellers for years and are used by pros worldwide. Once you try Blue Steel you'll be hooked. They feel great, ring true, are durable and long-lasting, and they just plain sound good.