The Duncan Hill Aerosphere smoking system (U.S. Pta. #4,275,747) utilizes the same principle of physics as the nanometer. The Aerosphere, visible as the brass pin on the side of the pipe, brings a scientifically measured amount of air into the stem with each puff. All Aerosphere smoking pipes are manufactured in the Carey shops in Bristow, Oklahoma. Each pipe is handmade with over 20 individual manufacturing steps. Every bowl is made from imported Mediterranean Briar, sanded and finished by hand to produce the fine craftsmanship that you see here. Learn the history behind the famous Duncan Hill Aerosphere System by clicking HERE.