Aircraft quality wire is manufactured to military specifications. This 18 gauge wire features standard tin-plated copper conductor with Tefzel insulation.
18 gauge red wire. We commonly use red for power wires. If you use 18 gauge for power then you must use the same gauge for ground.
18awg Tefzel wire is rated for 10 amps
See Military Specification Sheet MIL-W-22759-16a for wire construction details.