The series and group will be expressed by one figure each and the individual by two figures, so the numerical designation of any alloy will be fixed by a four-figure number preceded by L-, which indicates the class. The series and groups of Class L-Light Alloys that have been considered are those listed below: a) L-1XXX Series Light metals* and mother alloys Group L-11XX Aluminum Group L-13XX Magnesium Group L-14XX Beryllium Group L-15XX Titanium Group L-18XX AL base mother alloys.