These came to me from a friend, who was given them with a big pile of other stuff by another friend who was closing his professional recording studio. I know very little about them, not even how to use them, but I do know they aren't cheap junk and thought someone may be able to make use of them. Four pairs of stereo binding post terminals with banana jack ends. 56mm from end to end and 10mm diameter. Each pair is set in a plastic... thing, and they are heavy, 37 grams each. They appear to be gold plated, but I don't know for sure. I don't think they've been used, but I guess if they had I don't know how I would know. Three of the plastic pieces are cracked, as shown in the last photo, but the plastic is sturdy so it may not matter. I will leave these in the PylePro cable bag they came in, and slip them into a padded envelope for shipping. Whenever possible, I ship same or next day, so that you can receive your item as quickly as possible.