Number of drags per cart...250...approximately a packs worth. Can be refilled and it seem people are able to make them last a week or two before starting on a new cart. The cart have the atomizer in them so here is no wicking problem....since the atomizer runs
through the length of the cart. They aren't as easy to fill as a regular
ecig, but once you fill it, you don;t need to drip or top off. Some people do top off ever so often to make the cartridge last longer. The cart/atomizer cost $2-$3. The vapor is great, the taste is very good and the
throat hit is great. Closest to a real cig. All this is second hand info I am giving you....but people I trust tell me it is great.
google.... leaford vaporking review. Hope that helps