What makes Infinity Jars so great. Starting with what you see, our aesthetically-stunning high-quality, heavy-duty black glass exterior shimmers ultraviolet when held up to light and is topped by a BPA free plastic easy dripper essential oil lid. The biggest factor for the popularity of our essential oil bottle variety pack is it's performance and versatility. Airtight and leak proof. Cheque, takes just a quick twist of the wrist. Smell proof. Cheque, confirmed by a myriad of commentors, it will preserve aroma. Light proof. Yes, this is what really sets us apart. All Infinity Jars glass is designed in a lab (after years of rigorous research) with the specific intent to prevent light from degrading whatever is inside. Our ultraviolet glass not only looks sleek and sexy, it protects organic matter anything else on the market by refracting all visible light rays while permitting beneficial non-visible UVA (black light) and infrared light to pass. That's a sciency way of saying the glass is optimised to utilise the power of light for good. This style provides the ultimate storage for anything: cologne, perfumes, cleaning solutions, essential oils and almost anything else for a kitchen or bathroom. If you're a DIY-type or know one, this is the ultimate storage weapon, protecting precious contents more efficiently and preventing degradation for longer. It's gorgeous, modern, and like nothing you've ever seen. Your satisfaction is guaranteed! "The Infinity Jars 30-day-guarantee!" We've decided to put the risk on us! If you don't see the preservation you expected, or the jar just didn't work for you within 30 days of using our jars, simply send us an email and we'll refund your order (minus shipping). No questions asked! Listing includes 6 jars and 12 Infinity Jars self-labels.