OFRF Gear 24mm RTA Clean and exquisite. The OFRF Gear RTA is an advanced rebuildable atomizer that features compact dimensions for optimized aesthetics and portability, a simple and significant postless build deck design, and innovative air channels and burn chamber for great hits and lots of flavor. 24mm base diameter. Top-fill system with threaded top cap. Adjustable bottom airflow with dual slots. 2.3mL standard E-Liquid capacity. 3.5mL capacity with bubble glass tank (INCLUDED). Postless bui