Educator uses only high quality 18 AWG solid Bare copper conductor sunlight resistant direct burial underground perimeter wire. Our deluxe wire is manufactured in the USA using .045" Thick high molecular weight polyethylene insulation (hmwpe). this provides added strength, protection, and superior performance vs. Competitors' Wire. Hmwpe insulation is formulated to provide excellent oxidative stability, toughness, and abrasion resistance while providing superior environmental and thermal stress cracking resistance. Be aware of cheap knock-offs and imitations. Many competitive brands use inferior copper clad aluminum wire. Copper is much heavier than copper clad aluminum, which looks like copper buts it's not! Our premium pure bare copper wire is heavy, with a finished weight of approximately 10.2 pounds per 1, 000 FEET. That's always a sure way to know you are getting real copper!