This is an HPE LTO-9 Ultrium data cartridge, a magnetic tape cartridge used for large-scale backup and archival storage in enterprise tape libraries and autoloaders rather than everyday desktop use. LTO-9 is the ninth generation of the LTO (Linear Tape-Open) standard, with a native capacity of 18TB per cartridge; the "45TB" figure in this listing refers to the typical compressed capacity (roughly 2.5:1 compression), which is standard practice in how tape capacity is marketed. "RW" indicates it's a rewritable (not WORM/write-once) cartridge, and "non-custom labelled" means it ships without pre-printed barcode labels for the buyer's own asset-tracking scheme, as opposed to a pre-labelled version. This class of media is used by organisations running LTO tape backup infrastructure for cost-effective, long-term, offline data retention.