Vaporesso GTM Cores is designed for the Vaporesso Cascade Tank. It adapted EUC Core plug-n-pull coil change method for a fast, easy, mass free replacement process. Suited for cloud chaser who demands power vapor, smoother air flow, flavorful taste, durable coil at the same time. There are GTM 2 Coil 0.4ohm and GTM 8 Coil 0.15ohm available. 3pcs in a pack.