The Castle RDA is a high quality clone by CIGREEN. At 22 mm this is a wide dripper, it sits beautifully on most mechanical mods, for a flush even look. Made from high grade stainless steel and hand crafted the Castle unlike cheaper RDAs will last a long time and perform time after time. Rest assured this beast hits HARD, one of the hardest hitting RDAs we’ve yet come across. Flavor is also incredible on this unit, the Castle manages to bring out notes we did not believe to be there! What makes it really unique is the locking airflow control that looks much like a castle turret. It is extremely well built.