Aside from the high quality Stainless Steel coils that are included with the Crown 4, Uwell has crafted the Uwell Crown 4 Mesh Replacement Coils that are made of other durable metals. The Uwell Crown 4 Mesh Replacement Coils, or UN2 FeCrAl coils, are composed of Iron, Chromium, and Aluminum. These metals are bonded together and then manufactured into a mesh design to deliver a vaping experience like nothing else on the market to date. These UN2 atomizer heads have a resistance of 0.23 ohm and are rated for use between 60-70W. At these wattages, the UN2 coils provide outstanding flavor enhancement as well as massive cloud production and a smooth draw. The Uwell Crown 4 Sub-Ohm Tank coils utilize a threadless plug and play connection for quick and easy coil replacement. The Crown 4 coils also include 100% Organic Cotton Fiber for optimal wicking purposes with your favorite e-liquids. If you enjoy the wave of mesh coils that has been making a wave across the industry then be sure to vape with the Uwell Crown 4 Mesh Replacement Coils.