Oil Absorption and Headspace: Our all-in-one pens may appear less than full due to oil absorption by the ceramic heating elements, which can hold up to 150mg of oil. This ensures optimal performance when vaping. Built-In Extra Capacity: Our O2 Vape pens are designed with extra reservoir capacity (e.g., 0.7g for a 0.5g cart) to account for oil absorption, allow natural oil flow, and reduce leakage risks during transportation or air pressure changes. O2 vape hardware: disposable and rechargeable glass on glass with a ceramic atomizer. 0.5g of strain specific live rosin