These O-rings / Rubber Seals are used with the Smok TFV4 Tank found here. You can choose from a selection of colours. This kit consists of 3 complete sets of rubber seals.
Due to constant screw / unscrew of your electronic cigarette tank / clearomizer when refilling, rubbers tend to wear over time and when replacing the tank / clearomizer glass it is also advised to replace the rubbers to ensure no leakages occur which can loose costly eliquid inside the tank.
Please Note!! TFV4 Tank Included with the O-rings / Pictures are for illustration purposes only.