The BF-99 Style MTL RDTA is constructed from 316 Stainless Steel (body) and PC (tank) in 22mm diameter. The RDTA comes with a 2.5ml juice capacity PC tank. The RDTA supports side airflow adjustable control and bottom refilling. The hole airflow provides a big vapor and great flavor. Two Air Plugs: “gold” 1 hole x 1.00mm, 0.79mm² (Pre-installed); “red” 2 holes x 1.00mm, 1.58mm². Drip tip: modular tip with 4mm or 6mm hole. The RDTA also supports the Mouth lung (MTL) vaping experience.