Kingpen oil is made in our own state of the art manufacturing lab. It is distilled 5 times producing a high quality product that passes strict qualitative and quantitative tests. We then add proprietary blends of terpenes to achieve the best flavor possible. No PG, VG, PEG or other additives. KINGPEN BATTERIES AND CARTRIDGES Our hardware maintains some of the lowest failure rates in the industry and our cartridges are engineered for smooth and consistent airflow. In addition, our pens have multiple voltage levels so you can control your heat settings (low, medium and hot) and feature a pre-heat mode that allows you to heat the oil before you hit.