Custom manufactured by Leviton to Essential Sound Products specifications, these 5-20R duplex outlets (North America) are simply the best! Built to hospital-grade standards for increased mechanical integrity and isolated ground for the quietest backgrounds. Line and neutral contacts are made from electrical-grade bronze (approx. 98% copper) instead of brass (approx. 66% copper) for more natural warmth. Cryogenically treated to -300 degrees F for enhanced smoothness and resolution. Includes brushed satin nickel wall plate. Color = black.