According to an article on The Voice of Vietnam dated 29 September 2012, the State Bank of Vietnam has announced that 10,000- and 20,000-dong (US$0.50 and $1, respectively) notes printed on cotton (B337a, B340a, and B338a) will no longer be legal tender as of 1 January 2013, but may exchange them at SBV branches and other institutions. These denominations have been replaced by polymer notes (B343 and B344).