# Why are there uninsulated strands of wire in this sensor cable?

This is the cable coming from an SCT-013 current transformer current sensor. I don't understand the purpose of the bare wire strands that I have twisted and bent away from the rest of the two wires (they were previously all around the two wires).

Are they important? If I need to connect this sensor to a microcontroller, what should I do with them?

This is called the shield. It is designed to completely cover the other two wires. One end of the shield is connected to ground, and this effectively "shields" the other two wires from receiving RFI or EMI interference.