Seagate STT38000N SCSI Travan TR4 tape drive
Adaptec 2940 AU Ultra SCSI PCI card
Adaptec 2904 SCSI PCI card
Two SCSI cables
Associated manuals and discs
These were last used three years ago (under Linux) when they were working perfectly and have been stored in a warm dry environment ever since.
Kindly note that it is unlikely that any PC from within the last 15 years or so will have a PCI slot to fit the Adaptec cards (nowadays PCI-e is used) so they will be useless in a modern PC. Also modern Windows versions may not support them although Linux does.

Ancient Computer Components (SCSI) (Castle MK40)