This is a 25 foot length of 28 AWG tight twisted pair nickel plated copper wires with PTFE insulation. This wire is high temp rated at 260C 500F and 600 volts. This is a very high quality mil spec wire. The mil spec number is M16878/25-BCB-9-0. The OD of each wire is 0.0315 inch (0.80mm). Since this wire is nickel plated it is a little more difficult to solder. You will need to use rosin and a higher temperature to solder. This is a 25 foot length of wire, If you buy more than one I will ship it as a continuous length.