I think you have the description a little jumbled up on the web site. It says "These dual coil cartomizers will hold up to 2.5ml of liquid, come with a whistle tip, operate with a resistance of 1.5ohm...."
Should it be it holds 2.5ml of liquid and is 2.5ohm?
Well, whatever it is I got 2 coming to my mailbox today and will give them a try and report back.
No, we have 1.5 ohm, 2.0 ohm and 2.5 ohm XXL cartomizers which all hold up to 2.5ml of liquid.