Yeah, it's the 3.3ml with gunmetal end caps and tip. I also have the Derlin model, but I only use that tank for flavorless VG liquid, out of fear that a flavored liquid might leach into the plastic. Plus, if/when you drop the Derlin-capped tank on concrete, the plastic is soft and gets pitted and rough, which is annoying to say the least. Not that I make it a habit, but it has happened. Atleast with the aluminum caps, it's as strong as the unit. Also, before moving to an aluminum tip, I had my unit fall out of my pocket and it la des on the Derlin tip, which broke off in my carto. Luckily, I had a backup on hand, or I would've been mad.