says 15 but ships with 17 risers. (2-3 haven't been tested)

4 Brand new
the other 13 used.

PCI Express risers extend the mother board PCIE X1 slot to PCIE X16 slot. Provding a safe and reliable connectivity with more PCIE X16 graphic cards. Used on Ethereum Mining rigs or GPU Mining rigs mainly. X16 GPU slot come with Anti-interference metal shell make sure data transmission.