As part of their final project as Drexel University mechanical engineering students, James Ostman and Daniel Navin got to work on a major problem the U.S. faces: gun violence in schools.

For three months the duo of Army veterans, together with Drexel gradsPeter Lewis and Fen Tamulonis,worked on a design and filed a provisional patent on what they say could stave off the perils of an active shooter attack at a school or other facility.

And so they came up with the Ballistic Curtain Cordon System. Here’s the design team pitching the product at Drexel’s Senior Design Day last month:

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