MarsTeam Muramasa Style RTA is made from stainless steel and PEI. It comes with only 22mm base in 2mL capacity to supports 18650 mod. It supports single and dual coil build. Features: 510 threading connection; 316 stainless steel and PEI; Single / dual coil build; Adjustable airflow control; Comes with 22mm base in 2mL capacity