I went ahead and purchased a 510-T kit because I love the ideal of filling a tank and not messing with carts. Anyway, the kit came with 2, 220 MAH batteries and 2 atomizers. The atomizers have the gold band that says, "510-T". They work very well but boy do they get hot. Ouch! LOL. I ordered a couple more for another place and they don't say 510-T. They don;t get as hot but they do not work as well. Anyway, I need to learn ... what is the difference between low, normal and high resistance? Also, which type comes with the gold band? I'd rather not have the gold band but I do want it to say 510-T to be sure they are not knock offs.