New / unused with box and instructions. Berrylium copper contacts, gold plated.
These were made to work extra well with plugs which have a round ground pin. U shaped ground pins fit very tight, so I recommend squeezing the end to a round shape, then file the sharp edge off along the U shape, about a half inch down the length. This takes about five minutes, and works great. It will also work well in any other receptacle. I have four of these and am selling one. These are top quality for sonics. They are comparable to Teslaplex, Oyaide and Furutech Gold plated outlets. They hold the plug all the way in for a secure, resonant free contact, and are an asset when using heavy power cords which tend to pull out with their weight.