ABEC is an acronym for Annular Bearing Engineering Committee of the AFBMA
      (Anti-Friction Bearing Manufacturers Association Inc). The ABEC grades of
      bearings are a set of standards for the manufacturing tolerances of
      bearings. All quality manufacturers around the world manufacture to at
      least ABEC 1 standard. If you were to ask your local bearing supplier for
      a 608ZZ (common size used in skates), you would almost certainly receive
      an ABEC 1 bearing.