The most common of they are 510 Thread vape pens AKA 510 Batteries which can be transportable equipment that heat the oil to supply vapor that can be inhaled. 510 thread carts are classified as the most commonly utilized, though the are other measurements and types of THC carts at https://reidcrvxv.blogscribble.com/30600478/what-does-thc-vape-carts-mean