Was 25¢ per ft. NOW 50 ft. for $8.50. AWG 18, 7/26 stranded copper hook-up wire, tinned. ETFE (Tefzel®) insulated. Tefzel® is light, thin, resistant to abrasion, fuel, most chemicals, cuts and oil. The insulation is rated to 200°C (392°F). For automotive and aerospace where heat-resistance is required.