The cleanest way for you to get LIT UP. Also THC Cartridges are convenient, smooth, discreet, and portable, and flavorful. Lit Labs only use the highest quality of concentrates available. These vape pens are made only from the very best oil and terpenes available that DO NOT contain the harmful fillers such as MCT oil PG, VG, and Vitamin E acetate. In addition, the hardware is made from the purest metals (Lead Free) that are regularly tested for Quality Assurance.