Monster Cable XP-CI S500 CL Rated Monster XP Clear Jacket Compact Speaker Cable (500 ft. Spool) (Discontinued by Manufacturer) High Performance Cl3-rated Speaker Cable Maximizes In-wall Speaker Performance Patented Magnetic Flux Tube Construction For More Natural Music Reproduction Lpe Insulation Reduces Dielectric Signal Loss For Greater Clarity Unique Round Shape & Smooth, Flexible Jacket For Easy Installation Same award-winning XP technologies now in CL3 rated jacket for in-wall use. Patented Magnetic Flux Tube construction for more natural music reproduction. LPE insulation reduces dielectric signal loss for greater clarity. Unique round shape and smooth, flexible jacket for easy installation.