its a 20 mm atty so it fits the top of the proV cone nicely with no overhang and its got a smaller (but tall) chamber/topcap and the draw is kinda tight to some people but puts out amazing vapor when set up right. also has 5 holes in the deck for single.double or U wicks.
if needed ibtanks has spare glass cheaper then a non printed cobra tank will cost elsewhere. i think i bought the spares i have for $10?
phiniac sells custom
tanks for them (i have the fire breathing dragon on one)
i have two of them (3&5 ml) and sold my MMV DID in the classies after about 5 hours with it, not for everyone but you will find many fans who love it. alba vapors and Siam mods created a sweet little atty here.