Allied 18 AWG gauge Stranded Tinned Copper Wire, MTW, Hook-up, PVC,Black UL Style 1015/1230/1032/MTW. Tinned Copper. Lastly, tin copper wire hasmore electrical conductivity as compared to non-tinned copper wire. New Allied Wire & Cable PVC Machine Tool Wire, Hook-Up, Tinned-Copper Stranded. byJuly 3, 2026