Bare, annealed copper conforming to ASTM B-3 10AWG and smaller are Class B compressed stranding per ASTM B8 8AWG and larger are compact stranding per ASTM B496. Cross-linked Polyethylene (XLPE) type XHHW per UL 44, listed XHHW-2. Class B stranded bare annealed copper per ASTM B3 and B8. Impervious, continuously welded and corrugated aluminum alloy sheath. Black, flame retardant, moisture and sunlight resistant Polyvinyl Chloride (PVC).