The Jenna Rda is designed by Jai Haze and Manufactured by Ravens Moon Vapor, the same company that manufactured Jais first Rda the 502. The Jenna is a 22mm bf Rda was created for single coils but can also do dual coil builds, best builds for this is .4ohm to 1.0ohm+, if you use all kanthal it won’t be hard to get that kind of resistance.