Warwick ML5B EMP 5-String Bass Strings feature Enhanced Molecular Protection - a unique micron-thin coating that protects your bass strings against corrosion. EMP Bass strings feel like an uncoated set of strings, yet last much longer. Now you can have long-lasting bass strings with the tonal output and feel of uncoated bass strings. One Micron. That's all that stands between you and your bass guitar's tone.