The Crown II Mini is the smaller cousin to the popular Crown II tank. All the same design features, such as quick twist top fill cap, reverse lock screw tank halves and Crown II gold plated bullet coils. All these are in a smaller package to fit more mods. Now with 22mm diameter it means that this tank can go where all wider tanks cannot follow, such as the Pico or RX75 mods. As Uwell say "There is less of it, but more to it". The Uwell Crown 2 Mini tank is used the same coil as the Uwell Crown II Tank.