28 AWG single strand tin plated copper (TPC) triple insulated wire (TIW) in Dupont Teflon FEP insulation at .003 per layer. Dupont Teflon FEP is a Fluoropolymer compound with excellent dielectric properties, heat resistance, chemical resistance, and flexibility

Used in power supplies and transformers

This wire is rated for 155C and 1000V with a tensile strength of 3000 psi and a breakdown voltage of 12000V