The Competition Kit from Plan B Supply Co. is designed for competitive use and advanced users only. It comes with the DOC 24mm RDA and is BF ready. Super simple 2 post design with large post holes for even the biggest of builds with precision machining for a gorgeous finish. Comes with 810 size Ultem drip tip and a 510 adapter. Gold plated standard 510 pin and bf pin also included for squonk compatibility.