The Avocado 24 RDTA bottom airflow version is made of stainless steel and pyrex glass and features 4ml liquid capacity. With 24mm diameter, it can compatible with most of mods. It also comes with slide design, slide the pick to adjust the wick and fill hole. It is easy to wick and fill. There are also a ceramic block for single coil build. And it has various airflow control options, bottom airflow provides better flavor.