Fuehl 1000mg vape cartridges are filled with ultra-refined distillate and infused with cannabis-derived terpenes. They have several QC checkpoints to ensure the cartridges are filled to capacity. After the vapes are filled, the oil will begin to pre-wick into the atomizer, causing a significant drop in the visible oil level. In addition, air pressure after filling will cause the oil level to drop. The cartridge reservoir is designed to be larger on purpose