I believe you have 9 micron single mode.

SMF: single mode fiber
mbr 5mm: min bend radius 5mm
tb2: tight buffer construction
ofnr: optical fiber non-conductive riser
ft4: Canadian fire spec, similar to ofnr

Also I don't see the fiber count, but if this is left over from a FIOS install it's likely a single strand.

You can still do Ethernet over this cable by using single mode connectors and BX10 optics, but that might eat up any cost savings gained from reusing the fiber.