The Smok R40 40W Kit is a great starter kit for beginners because it comes with all the essential accessories. The Kit includes both R40 TC Box Mod and Micro Basic Sub-Ohm TC Tank which are both 510 compatible so they can be interchanged easily if you have a different preference. The R40 box mod is built of durable stainless steel and features a micro USB rechargeable, 1900 mAh built in battery. The R40 Box Mod can last all day off a single charge and can be recharged easily in approximately 1 hour. The Micro Basic Sub-Ohm TC Tank is also made from stainless steel with the exception of the material chamber which is Pyrex glass to keep liquids fresh and untainted. The Micro Basic Sub-Ohm TC Tank has quad adjustable airflow and utilizes a micro core system.