I stocked up a long time ago on 510 cartos for my Chuck and Riva. I'm running out and I can't remember what I got before. I use 6v Chuck with a 510 adapter exclusively at home and the one's I've been using from Nhaler work great and last for months but I can't remember if they are low or high resistance. They were blank and stainless steel. I tried them on the Riva but they don't work so great there. Low vapor and no hit. So what's the best cartos to get for the 6V Chuck and standard battery Riva? Sorry I've been away so long. 
