What sort of oil/lube is "Shimano Internal Hub Maintenance Oil"? https://www.amazon.com/Shimano-Internal-Hub-Maintenance-Oil/dp/B00O58QCQY

I know what it is for. But what is it composed of?
I am not 100% sure for Shimano but my Rohloff Hub used SAE 80 weight gear oil.  I can't imagine shimano has magic that isn't covered by the SAE standard.