"Beatle Bass" black nylon tapewound, 050w 065w 080w 100w.  Fits Hofner “Beatle” basses and similar models that require 34″ distance from ball-end to silk.  La Bella indicates: "Please do not use this set to replace any of our medium scale bass sets as they will not fit medium scale basses due to the string construction.  La Bella Beatle Bass sets can ONLY be used on Beatle Basses (and very similar models).  Do NOT try them on standard basses or they will break".