This is two 10 foot lengths of 38 AWG wire, 20 feet total. This is some of my smallest diameter wire. One wire is silver plated copper with PTFE insulation. It is stranded with 7 strands. It is made by GORE. The OD of this wire is, 0.0085 inch (0.21mm). This wire is violet. The other wire is one strand solid copper with cloth insulation. It is made by American Magnet Wire. The OD of this wire is 0.0060 inch (0.15mm). The color of this wire is blue.