Alpha Wire EcoWire hook-up wire uses a modified polyphenylene ether (mPPE) thermoplastic that is inherently lighter, tougher and more flame resistance than PVC. The result is UL AWM wires that are smaller than their PVC-based counterparts. The non-halogenated insulation contains no heavy metal pigments, allowing it to help manufacturers to meet WEEE requirements. I.E. a 20 AWG PVC-insulated wire has a diameter of 0.101 inch (2.57 mm).