This is a 40 foot assortment of silver plated copper wire with PTFE (Teflon) insulation. There is four 10 foot lengths of wire making 40 feet. The colors are red, green, yellow/white, and black. This wire is all 32 AWG stranded wire. The red, green and yellow wire have 7 strands, the black wire has 19 strands. Two of these wires have a thicker PTFE (insulation) giving them a larger outside diameter. The inside conductors are the same 32 AWG on all four wires. The red and the green are the same and have the smallest outside diameter .0120 inch 0.30mm. The black is a little larger .0210 inch .53mm and the yellow/white is the largest .0260 inch 0.66mm.  Because this wire is so small it would be great for making lightsabers. This is very high quality wire made in the USA.  I Will ship Worldwide. There is four 10 foot lengths of wire in this assortment. If you buy more than one I will ship longer lengths of all four colors.