The Uwell Crown RBA Coil Kit is an optional system to an existing Uwell Crown Sub-Ohm Tank (sold separately) that allows for users to build and rebuild their very own coils. Encased in a convenient polish packaging, the RBA Coil kit includes everything you need to start building, including a SUS316 foo-grade heating wire. spare screws. and detailed step-by-step guide to find the perfect vape range. Pair with the included Japanese Organic Cotton pad to maximal the robust flavors of your eliquids! Control the quality of your atomizer to get the most out of your experience.