This 25mm Rda features a two post build deck with dual 2.5mm post holes. The inovative airflow style brings air in from the front and back of the coil. The gold plated copper positive post has a convex sheild shaped cap that acts as a juice splitter. Dripping on this device is easier because you can drip through the mouthpiece, and the juice splitter will make juice flow to both sides. The Sumo also features a PEEK insulator, copper 510, 7mm proprietary mouth piece, 5mm juice well and double oring securing system.