Hi guys, I've thought I would share my experience and some links regarding the different brands of hookah heads that you can find in the marked rights now: Kelvin H1, H1 , H2, H6, HMAX hookah head (The H1 comes rebranded as sisha palace's, there are many other rebrandings). The looks and works of the H1 are great, but the 900mAH battery and the 2x2ml cartomizers mean's shorter vaping sessions. From my experience with the H1, I recommend you guys buy the H6 instead (same great looks but much improved duration). The only downside I can see is that there is no voltage regulation, I've seen some retail links saying that the operating voltage is 4.2V. Square e-head: Up until now, one of the most popular hookah heads. You can choose between three different colours. It comes with an 8ml tank and a 2200mAH battery. This e-head appears also to be sold under other names. I've bought one and will review it shortly. POP30 (30W) Hookah head With 30W and voltage regulator, seems very similar to the Square e-head, it comes, however with 4 cartomizers and you can select which two flavours you want to vape. POP50 (50W) Hookah head The bigger brother of the POP 30, they claim it to be the most powerful e-head. POP Filrkin Hookah head A hookah head that connects to an external battery. Flux e-bowl It comes with a huge 50ml tank and a nice 2800maH battery, does not appear to have a voltage regulator. Fantasia e-bowl Comes with their own cartridges, so probably you won't be able to mix your own e-liquids. Feel free to add more!