Cleartone Electric Strings are coated, and they sound great. Thanks to Cleartone Strings and their EMP technology, coated strings sound better than ever. Cleartone's EMP (Enhanced Molecular Protection) is a patent pending process that extends the string's life by protecting it against oils from your hands, elements in the air, and just general string deterioration. EMP coating doesn't feel slick or slippery, and it won't flake off. You won't even know it is there. In a nut shell, it helps your strings stay fresh and clean without killing your tone.