The United States ten-dollar bill ($10) is a denomination of U.S. currency. The obverse of the bill features the portrait of Alexander Hamilton, who served as the first U.S. Secretary of the Treasury from 1789–95. The reverse features the U.S. Treasury Building. All $10 bills issued today are Federal Reserve Notes. As of December 2013, the average life of a $10 bill is 4.5 years, or about 54 months, before it is replaced due to wear. Ten-dollar bills are delivered by Federal Reserve Banks in yellow straps.