The Russian 91%, a rebuildable tank atomizer (RTA), is a clone of the very popular Kayfun Lite RTA. The Russian 91% improves upon the Kayfun Lite with its adjustable airflow control. Made of high quality stainless steel, this tank features a pressurized chamber, an adjustable positive pin, and dual function modes. This means this RTA can also be used as an RDA (rebuildable dripper atomizer). Additionally, all parts are interchangeable with the Kayfun Lite. The Russian 91% includes: -The Russian 91% with a Clear Center Tank -Needle Nose Bottle -Assembling Instructions -Screwdriver key chain -510 Drip Tip Adaptor -Metal Center Tank Option -Atomizer Wire (1 meter) -Atomizer Wick (1 meter) -Spare Parts Kit ( Airflow Screws x 2, Post screws x 2, O-rings x 6) Disclaimer: Rebuildable atomizers are for experienced vapers with working knowledge of how electronic devices work along with access to the appropriate safety tools. Please ensure proper precautions are taken when using these devices as to not cause damage and/or harm to the atomizer, device, or yourself.