Ehpro Kelpie RTA comes with 25mm diameter and 2ml capacity, the 3.5ml replacement glass tube also included. Kelpie RTA maintains stainless steel body, glass tube and resin drip tip. Ehpro Kelpie combines the adjustment bottom airflow and Honeycomb air slot deck for wonderful flavor. The Kelpie is easy to build single coil, there are two ways to build the coil. Designed by Ehpro & Vaping with Vic Dual posts for easy coil installation Honeycomb air slot deck for wonderful flavor Easy single coil building deck Adjustment bottom airflow Innovative two ways to build the coil Convenient to replace the cotton Brand: Ehpro Model Kelpie Tank Capacity 2ml/3.5ml Diameter 25mm Size 40 x 25mm