The SMOK TFV18 Tank is compatible with the SMOK TFV18 Replacement Coil. Its core is made of organic cotton, and its design is mesh. It has two options: a 0.15 ohm TFV18 Dual Mesh Coil and a 0.33 ohm TFV18 Meshed Coil. https://www.vapeuniverse.co/products/smok-tfv18-mesh-coils?_pos=1&_sid=335448dd0&_ss=r&variant=45086822334716