Another atomizer from Engine family - known as Engine Nano si made by OBS company. Very good atty working with single coil, using top filling and top airflow. I must say that I love it and it is MUST vape for me. But it is not the best atty. I not understand that overhype for this atty. Yes it is very good, but not the best atty of 2016. At all very good for whole day vape. 25mm diameter, 5,3ml capacity, quite good flavor, lot of vapor.