SLiP XTRM takes everything that makes our in-wall cables so attractive to installers—the super-slippery, easy-to-pull CL3/FT4-rated jacket with easy-to-read feet and meter markers—and adds extreme AudioQuest performance: A carefully finessed combination of Perfect-Surface Copper (PSC) and Long-Grain Copper (LGC) affords performance approaching that of the purer PSC, but at a much lower cost. In addition, True-Concentric Conductor Technology, a more sophisticated form of our Semi-Solid Concentric geometry, significantly improves clarity and resolution by further minimizing the distortion caused by strand interaction. The net result is simply the highest performing, easiest-to-install CL3/FT4-certified line of speaker cables in the business!