90% OFC Spiral Shield for Effective EMI and RFI Rejection and Flexibility. Length: 20 Ft. Color: Black All RockvilIe pro audio cables are made with 100% copperwhich boosts the efficiency of the cable. There is nothing better than 100%copper. Most of the cheaper cables on the market do not use 100% copper, insteadthey make their cables with CCA (Copper Clad Aluminum). CCA cables do notperform on the level that 100% copper cables perform at. CCA will not conductsignals efficiently. A 12 gauge CCA cable will not even perform as well as a 14gauge 100% pure copper cable, which will in turn, affect the performance andlongevity of your equipment. If you find cables on the market that do notmention the copper content, there is a good chance that they are selling you acheaper cable that is CCA and not 100% copper. RockvilIe pays an inspectioncompany to oversee the manufacturing of the product to ensure that we provide a100% Oxygen Free Copper Cable (OFC). Our OFC cables are less prone to oxidation,and will provide maximum signal transfer. The other important factor of a cable is the shielding. Most of the good brandson the market have about 85% shielding coverage, so we decided to take ourshielding a step further. RockvilIe cables are shielded with a tight coppermesh, covering 90% of the cable! The high percentage of coverage increases theability to absorb the Electromagnetic Interference (EMI) and Radio FrequencyInterference (RFI) that suppresses signal and degrades the performance ofequipment. RockvilIe Cables copper shielding provides great flexibility,maintains a durable structural integrity, while decreasing signal interferenceensuring enhanced signal clarity with every use.