This 510 cbd cartridge is made of Pyrex glass tube+ Stainless Steel. Removable central post allows oil-filling easily. It also has top filling and top airflow, which gives you a smoothly big vapor. Try it on now!

Details: - Removable central post - Pyrex glass tube+ Stainless Steel - 0.5ml - 4*1.0mm oil holes - 1.2ohm ceramic coil - top fill and top airflow - 52.5mm(L)*11.2mm(D)

Features: 1) Removable central post 2) Top filling and Top Airflow 3) Vertical ceramic coil 4) High clear quartz glass tube 5) 510 thread 6) With oil absorb hole suitable to different concentration cbd/co2 oil. 7) OEM & ODM welcome