Description Product Reviews 18/4 Plenum Shielded Security Speaker Cable Stranded CMP 1000′ Plenum Shielded CMP Rated 18 AWG 4 Conductor Security Alarm Cable is made with 7 stranded bare copper conductors. SHIELEDED PLENUM RATED 18/4 1000ft Pro-Installer Series CMP,CMR,CL2 Rated for PLENUM, In-Wall or Riser Applications Professional Use Quality Stranded Copper Wire Conductors 0 Reviews Hide Reviews Product Reviews