Warwick ML6 EMP Coated 6-String Bass Strings feature Enhanced Molecular Protection - a unique micron-thin coating that protects your bass strings against corrosion. EMP Bass strings feel like uncoated strings, yet last much longer. Now you can have long lasting bass guitar strings with the tonal output and feel of uncoated bass strings. .020-.040-.060-.100-.130 One Micron. That's all that stands between you and your bass guitar's tone.