Extract Labs’ full spectrum Extract Tanks are among the most natural vape oil products on the market and are an easy way to get started with vaping CBD. Extract Tanks use only CO2-extracted distillate and terpenes. They do not contain any common fillers such as vegetable glycerin, propylene glycol, MCT, or thinning agents, and are vitamin E acetate-free, guaranteed. Extract Tanks are 500mg CBD/CBT/CBG and 510 threaded. Single use and non-refillable.