Package Included: 1 x Berserker MTL RTA 1 x 4.5ml Gglass Tube 1 x 510 Delrin Drip Tip 1 x Extra Connector 1 x Bag Of Accessories Material: 304 Stainless Steel Color: Black/Silver Diameter: 24 mm Height: 45 mm/55 mm Thread: 510 Capacity: 2 ml/4.5 ml Features: 1.Top filling. Easy to build. 2ml easy switch to 4.5ml capactity. Simply possibility of a real cigarette tightening. Berserker MTL RTA, a collaboration project with Alex from vapersmd, delivers a really tight draw with a smallest airflow hole of 0.8mm. It originally holds 2ml juice and with a taller chimney and glass the capacity can be increased to be 4.5ml, supporting your vaping for a long time. Notes: Manual measuring, please allow 1 ~ 5 mm error,thank you.