Vaporesso ECU coils (ECO Universal coils)Vaporesso Traditional EUC (ECO Universal coils) are a real game changer to vaping, is designed to deliver cloud vapor with the purest flavor. The EUC will allow you to replace only the core of your atomizer which is called EUC by dropping it in and out of its casing, leaving the metal sleeve. It can be used with Estoc Tank Target Pro ORC Gemini Tank (need an extra sleeve)Eco Universal (EUC) Clapton Ceramic Coil Vaporesso {10}