On February 28, 2007, new designs of the 5 to 50 naira banknotes were introduced. Originally the 10, 20 and 50 naira were to be polymer banknotes, but the 5,10 and 50 were delayed to late 2009 and only the 20 was released in polymer. The notes are slightly smaller (130 x 23 mm) and redesigned from the preceding issues. In mid-2009 when Sanusi Lamido Sanusi took over as CBN Governor he eventually changed the 5, 10 and 50 naira to polymer notes.