The F39-JD10A is a 10-meter cable assembly for the Omron F3SR-B series safety light curtains. It's the interconnect between the emitter/receiver heads and the control unit, carrying power and signals. The 10m length covers typical machine guarding spans where the controller sits in a panel a few meters from the sensing zone.
Bulk packaging means it ships loose, not on a reel or in a retail box. For a panel builder or MRO storeroom, that's one less piece of packaging to dispose of. The cable mates directly to the F3SR-B series heads — no adapter or custom termination needed.