Currently here at Spartan Distribution we have three different Uwell Tanks available. The Uwell Crown 4, Uwell Valyrian 2 tank and the Uwell Valyrian tank. The Uwell Crown 4 tank comes in two different colors. Sleek black for those who are looking for something simple. The other color is rainbow for those who are looking for something to match their bright personality. The Uwell Crown 4 tanks have two different capacities. 5mL standard glass and 6mL bubble glass tank.