Description R1-BX Resistive value 120 ohm Input voltage 3-10V Gauge Factor sensitivity：2.0－2.20 Precision level: 0.02 Size 6.6*3.6 mm maximum strain : 20000 um/m Temperature -30~60 degree. Each end has two very tiny solder cable lead out. Siliver wires, without insulated materials covered. R2-BFH Based on R1 3AA version, but soldered insulated 10CM wires. You can directly solder on pads or holes on PCB. Each purchase is for 2pcs. The sensor should be glued on target medium, see more details about strain gauge on wikipedia.
