18/4 500FT 18AWG GAUGE 4 STRANDED CONDUCTOR WHITE SHIELDED CONTROL SECURITY BURGLAR ALARM WIRE SPEAKER CABLE CL2 Rated Stranded Shielded 18-Gauge 500ft White 18/4 AWG Stranded Conductor. CCA (Copper Clad Aluminum). Polyvinyl Chloride (PVC), Aluminum Foil Shielding Easy tangle free pull box. Running feet printed every 2ft on the cable, makes measuring easy Use for Indoor applications RoHS Compliants, ISO-9001 Certified