Compressed Round Wound strings from the same factory which produced the originals we have all grown used to, but now no longer available from Rickenbacker. Compressed Round Wounds are a half way house between Round wound and Flat wound retaining the Round wound tone. Nickel plated steel electric. “Inverse String Winding” compresses the outermost part of the cover wrap leaving the internal portion of the string intact. This design gives a bright sound with a semi-flat feel. Recommended for all Rickenbacker standard scale guitars,(And that’s most of them!)