Patented RCA Silver-Tube™ plug with 8.5mm opening for use with Oasis Interconnect, Equinox Interconnect, and Starlight Digital Audio cables. Set of 2. Aluminum red lettered barrels or white lettered barrels are available. Red lettered barrels are standard, if you prefer white, please specify in the "Add Notes" field when you get to the cart. Shrink tubing is included.