I bought a Bolt in gun metal 'cause it was a sexy looking device, and the only tanks I could find to match (in gun metal) were the "SmokTech U-DCT 6ML Tanks" with the 1.5 ohm "SmokTech CE2 DCT-2 No Filler Pre-Punched Cartos". Perhaps I place to much emphasis on the aesthetics of my devices, but...