Carbon-resistant wires have a core consisting of a fibreglass braid impregnated with carbon surrounded by a double layer of silicone and fibreglass.

The copper core is covered by a silicone sheath which acts as an insulator as well as making it physically more rigid.

The silicone rubber outer insulation can resist high temperatures and the corrosive action of petrol and oil.

The fibreglass performs the function of making the wire more resistant to traction.

The resistance of the wire with resistance to carbon is calculated in the following way:
1 m wire ≙ 10 kΩ - 23 kΩ.