Cleartone EMP Treated Electric NPS Guitar Strings last up to 5 times longer than traditionally manufactured uncoated strings. The Cleartone Heavy Series strings are designed for players that play hard. They are built to take all the aggression that comes with heavier styles of play. The Cleartone EMP Treatment is less than one micron thin so these feel like a traditional string! Cleartone EMP Treated Guitar Strings also have more output and sustain. There is no coating to flake off or get fuzzy on you so your strings feel and sound great.