18/4 Awg 1000FT Shielded Security Cable Alarm Wire - Audio - Access - Control - CMR/CL3-R/FPLR Rated In-Wall or Riser - Made in the USA - Stranded Bare Solid Copper (not copper clad aluminum) 18 gauge 4 Conductor 1000 Feet Professional - Shielded 18/4 awg Security Alarm Wire - 1000FT - 18 Gauge 4 Conductor Stranded Bare Solid Copper Conductors (not inferior copper clad aluminum) - 100% Al-Mylar Shielding with Drain Wire Rated CMR/CL2R/CL3R/FPLR for Home In-Wall and Commercial Riser Applications (not plenum rated) Made in the USA exclusively for DiyHomeTheaterSupply stores per our exacting standards UL/ETL Listed Certified Rohs "Green" Safe Product for use in all states