The Tower of Voices is conceived as a monumental, ninety-three feet tall musical instrument holding forty wind chimes, representing the forty passengers and crew members of Flight 93. The intent is to create a set of forty tones (voices) that can connote through consonance the serenity and nobility of the site while also through dissonance recalling the event that consecrated the site.  PennStress produced (18) Precast Concrete Columns, (37) Precast Concrete Beams, (3) Precast Concrete Caps, and (8) Precast Concrete Benches.