Manufactured to last 3 times longer than conventional strings, the American company Dean Markley used the pioneering "cryogenic" method to create a set of Electric Guitar strings rich in tone, with great presence and intensity while simultaneously offering top-notch playability with strong sustain. The "cryogenic" method cleans the "harsh" high and low frequencies that distort the guitar's sound, offering greater durability and better tone with rich and clear harmonics. They contain 8% nickel/nickel-plated with hex-core wire.