There are different types of weed pen available when buying vape. These can be broken down into a few main categories. The first and the most classical one is powered by a heating coil. Even though this one is considered a vaporizer it is actually a combustion style pen because a spiral heating coil actually touches the flower and makes a combustion type smoke and vapor that is inhaled. The other most common type is a full ceramic heating chamber that is actually the most popular one. The herbs sit within a chamber or a ceramic style oven and they get heated between 350F and 440F and it will vaporize.
Within Ceramic dry herb vapes there is convection and conduction vapes which differs on the heating style. lastly there is a vaporizer which uses an electric heating chamber but will use either a balloon or whip to transfer the vapor to the end user. These are mostly table top units however and usually plug into the wall outlet whereas the other units are battery operated.