The T-core BDC Replacement Head is designed for the T-dux clearomizer. Like the T-Dux 1.6 and T-Dux 2.0, T-dux 3.0 rests in a ceramic cup and can be replaced. It tastes great and produces lots of vapor. We offer differnt ohm resistance to make sure it's compatible with different batteries or mods. We offer 1.5ohm and 2.1ohm. Replacement Heads sold in a 5 pack.