This 9/11 coin Commemorates the lives of those who perished in the September 11th, 2001 tradgedy at the World Trade Center. Each coin is just over 1 1/2-inches in diameter and weighs in at just over an ounce. Not only a way to remember the fallen heroes of 9/11, these coins are a great collectors item to obtain. If you don't have your 9/11 Commemorative challenge coin now, then it is highly recommended you order yours today. We will never forget that day!