The Exxus EX3 Oil Cartridge has a 1ml capacity and can hold e-liquid or herbal oils. The exterior is made from borosilicate glass and the interior is stainless steel with a ceramic coil. Ceramic coils retain heat longer, which means less wear and tear on the battery and the best delivery of vapor. This ensures quality and tasty flavor. The EX3 cart has a flattened mouthpiece giving it a more comfortable and ergonomic draw. The male 510 threading works on a variety of Exxus products as well as a number of other batteries.