Vntg HEAT-AID 12 Hr Dry Heat Pad Self Heating 1981 Prop 4 X 6" New Lot of 2 Rare

Vntg HEAT-AID 12 Hr Dry Heat Pad Self Heating 1981 New in Package Lot of 2. See pics. One perfect condition, one package has a very small tear in the upper left of the packaging only. These are 44 years old. May or may not work. Would be a good movie prop.