1. M781 is a disposable  oil atomizer3. This atomzier is small but excellent.4. Battery tube is 303 stainless, clearomizer tube is PCTG material and mouthpice part is PC material.5. Atomizer bottom is oxygen-free copper with better electrical conductivity.*Magnet connection for battery bottom and USB port, charging easily!*Specially designed for  oil with real cig size!