20 AWG single strand tin plated copper (TPC) triple insulated wire (TIW) in Dupont Tefzel ETFE insulation at .001 per layer. Dupont Tefzel ETFE is a Fluoropolymer compound with superior heat resistance, exceptional dielectric properties and chemical resistance

Used in pulse and signal transformers. This is the thinnest TIW on the market.

This wire is rated for 155C and 1000V with a tensile strength of 6500 psi and a breakdown voltage of 4500V