This load sensor, sometimes called a strain gauge, is the same one found in digital bathroom scales.
The sensor is a group of half-bridge strain gauge

Name: 4Pcs 50KG Human Scale Load Cell Weight Sensors + HX711 Module
Model: 925119
Material: Plastic,Metal

Ways to use it :
- Use one sensor with an external resistor to form a full-bridge measurement, the range of a sensor range: 50kg. External resistance on the higher requirements.
- Use two sensors to form a full-bridge measurement, measuring range for the sum of the two sensors: 50kgx2 = 100kg
- Use four sensors to form a full-bridge measurement, measuring range for the sum of four sensors: 50kgx4 = 200kg

Package Included
4x 50kg Human Scale Load Cell
1x HX711 AD weighing module
1x 10Pin Needle