The BFHN replacement coil is designed for the Joyetech eGo AIO ECO. This coil is optimized for use with high nicotine liquid. It supports mouth-to-lung inhale.
This is NOT a review of Vapes but of the coils themselves. These are the worst coils ever and not just the ones I got here, everyone I've tried, used or bought have been horrible. If they work at all then they work for maybe half a tank. I would recommend not using any device that require these coils.
Vapes is great though, highly recommend them.