Force Sensitive Resistor 0.5" - SEN-09375 - SparkFun Electronics
Pressure Sensor 0.5 Inch Dia FSR402 Resistance Type Thin Film Pressure Sensor Force Sensing Resistor Long Tail 0-10kg for Arduino: Amazon.com: Industrial & Scientific
HALJIA 0.5 Inch Dia FSR402 Resistive Thin Film Pressure Sensor Force S