Go for the one with the copper handholds. There larger surface area decreases resistance and this is what u want, and the paper towel wrappings tend not to dry out to quick because of this larger area. And it is easier to hold them against other parts of your body, like either side of your abdomen, to zap ur intestines and get them nasty parasites. By the way Zapping on 2,500 frequency either side of abdomen tingles quite alot.