18 AWG, 16 strands of pure copper wire per channel, delivering clarity and undistorted signals to every sound system. 99.99 % oxygen free copper (OFC) conductors. Compatible with bare wire connectors, banana plugs, spade tips, or bent pin connectors. UL safety certified, NEC 725 Class 2 rated for home and commercial use. Sequential 2 ft. length markings in descending order from the start of the reel to the core