I noticed that they're very inconsistent. I've used one where I punched 4 large holes in a carto that was already prepunched, then put it in a tank and it still wouldn't wick the juice, wow. The filler material used must be all types of different sizes when packed in the carto shell. I've also used one where I put over 1ml of juice and let it sit for 30 minutes and it would burn out right away when I tried to vape it. Also, the threading is not smooth and screws on weird. I noticed Boge's are much smoother and fits perfectly against the Provari top cap. I only wish there were more manufacturers.
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