NickelSteel Electric™.012 .015 .026 .034 .044 .054 The cornerstone of Dean Markley Strings. If you lined up every set of NickelSteel Electric™ strings ever sold end to end, you would have a really, really long line of guitar string sets. Dean Markley NickelSteel Electric™… on top of the best-seller's list year after year. NickelSteel Electric™ sports new graphics, tarnish resistant individual envelopes and an Environmental box. NickelSteel Electrics sound fantastic and last a super long time.