Force Sensing Resistors use the electrical property of resistance to measure the force (or pressure) applied to a sensor. A force sensing resistor is made up of two parts. The first is a resistive material applied to a film. The second is a set of digitating contacts applied to another film. The resistive material serves to make an electrical path between the two sets of conductors on the other film. When a force is applied to this sensor, a better connection is made between the contacts, hence the conductivity is increased. Mikael Fernstrom recommended these over Piezo, due to greater sensitivity.
WebRef: http://soundlab.cs.princeton.edu/learning/tutorials/sensors/node8.html
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