This is a single working crossover for the original Polk Monitor 5Jr bookshelf speaker. Specifically, it is for the early/mid-80's 4-ohm model with the front port (not to be confused with the later 5Jr+ model, which was slightly larger speaker and had a passive radiator instead of an open front port).
It's taken from a fully working pair of 5Jr's. You'll need the fuse for the crossover (250V, 1 amp fast blow AGC). This crossover includes the four rear mounting screws.
I have two of these crossovers available, and will make a deal for both.