Here"s a secret, Dean Markley NickelSteel Electric guitar strings are made of the highest quality 8% zinc steel for incredible tone that lasts longer than other strings. Okay, it"s not really a secret, but there"s no denying that Dean Markley NickelSteel Electric guitar strings totally rule! If you want the tone that"s turned tons of top records gold, platinum, and beyond for over 30 years, then you"re looking for Dean Markley NickelSteel Electric guitar strings.