Grand General's general purpose primary wires are ideal for trucks, automobiles, trailers, tractors, utility vehicles, RVs, buses, boats and more. Single conductor copper with flexible PVC outer-jacket resists water, chemical, oil and abrasion. The smooth surface makes it ideal for pulling through loom and tubing. Temperature range is up to 105C. Grand General's primary wires are available in 18, 16, 14, 12 and 10 gauges.