SCP's Contractor Grade Speaker Cables are manufactured for budget minded installations that require only standard grade speaker cables. SCP Contractor Grade Speaker Cables feature twisted-pair construction with medium strand count oxygen free copper (OFC). Twisted-pair construction reduces sonic degradation and interference while also providing a smaller and rounder diameter that is very flexible and friction resistant. SCP Contractor Grade Speaker Cables are available in our industry leading Pull Box; allowing for the easiest and fastest installations... with no tangles and no wastage. In addition, all Contractor Grade Speaker Cables come with sequential foot/meter markings printed on the jacket. All Contractor Grade Speaker Cables are UL and In-Wall rated. NEC: CMR; CEC: FT4.