SMOK Micro TFV4 Tank Kit – 2.5ml, Black, features three type of heating cores for different vaping needs: sub-ohm core (0.3ohm Micro CLP2) , standard resistance core (1.8ohm Micro MTL) and rebuildable single clapton core (Micro RCA). With 2 larger replacement tubes and adapters, the TFV4 can be extended to 3.5ml and 5ml so that you can enjoy vaping with Micro TFV4 anywhere and anytime. Top filling and high-quality stainless steel & glass, Micro TFV4 brings excellent flavor and taste to you. Black and Steel colors.