Well; I am good to go on Isotope Lead for some time; but I MAY have to resort to melting down the 1000 lbs or so of Lead Diving Weights I still have in storage - gave up my SCUBA INSTRUCTOR status several years ago so I no longer use the Dive Weights for training - but still have all the equipment. These weights were all cast from either the Oldddddd Lead Telephone Cable or Wheel Weights - NO ZINKER-STINKERS in those weights.