This is a 20 foot length of silver plated copper wire with PTFE (Teflon) insulation. This wire is 29 AWG with 51 strands. Each strand is 46 AWG silver plated copper. Because there is very many strands this wire is very flexible. Most wire this size 28 or 30 AWG just has either 7 or 19 strands. This wire has 51 strands! This is small wire the outside diameter with insulation is 0.0170 inch (0.43mm).  Each of the 51 strands are 0.0010 inch (0.03mm). This is very high quality vintage wire made in the USA. This wire is on spools so if you buy more than one length I will ship as a continues length.