The Boge 510 DXXL Cartomizer is very popular favorite for some good reasons, the flavor, the reliability, ease of the draw and simply the convenience. These are 2.0-2.4ohm, most are at 2.2ohm. The tube length is 45mm and you have your choice of 2 different size pre-punched holes so you can put them in your favorite tank. Combine these things with the cost and they are a great value to boot.
Warranty Info: The Cartomizers have a DOA guaranty only