9/11 anniversary tribute coin set

On septermber 11,2001 terrorists highjacked four airplanes and used them as weapons to attack the United States. Two airplanes were crashed into the twin towers to the world trade center in New York City, resulting in the collapse of the buildings. A third airplane was crashed into the Pentagon, these coins are in tribute of nearly 3000 innocent people lost their lives on september 11,2001.
the coins are as follows
1 x The Trade Center
1 x The Pentagon
1 x Flight 93
then there are 3 other coins which they released for the 1st,2nd and 3rd years after september 11, 2001.