I'd put them at about 70-80lbs each, not as bad as I expected, 3/16" and hollow. They are easier to manoeuvre than my multimount M8000 with steel cable.
Installed and painted pictures to come.
Edit: Just googled a multimount Warn M8000, the winch alone is 71 lbs, so after hoisting them around and the winch with handles, yes they are definitely under 70 lbs... Kinda hard to compare to dumbells at the gym.