Thanks, PZ! Good idea about the paper towels.... I am washing the sleeves after each use, but that sounds a lot easier! But wait - aren't we supposed to have some chromium in our diets (i.e. from picolinate), or is it introduced in some kind of harmful way via the zapper? Could we really get too much of those metals in our system from a zapper as to result in a mineral imbalance or toxic situation? And what problems can copper cause?