SMOK TFV16 Replacement Glass Tube #9 is a replacement glass tube for SMOK's TFV16 tank. Its transparent material allows you to conveniently view e-liquid levels. It comes in a unique shape that is able to accommodate more e-liquid than standard glass tubes. It's able to hold up to 9mL of your preferred e-liquid. Glass tubes are a smart purchase since they're prone to breaking. Get it as a spare for your TFV16 tank, you'll thank us later.