4 pieces or 2 pairs of Pomona MDP-S Double or Dual Banana Plug Connectors, with shorting bar. The photo shows a pair, but you get 2 pairs or 4 of them.  Seem to be new / NOS, but I don't know 100% for sure. Super clean, though.

Free shipping in the US.

I have a lot of these, so if you need a bunch, make an offer for a bulk deal.