Dura power's strength and lasting power can be traced to the ability of Carlisle engineering to successfully combine the advantages of Raw Edge technology with its unique, state-of-the-art CNA belt building process. Centralized Neutral Axis refers to the placement of the cords through the belt?s midsection. This lower cord placement lets Carlisle make use of the most efficient Raw Edge production process in the industry. To further assure top performance, Dura power II utilizes Stiflex?loaded Neoprene rubber a compound previously found only in higher priced premium belts. By combining Raw Edge belt sidewalls, CNA cord placement and Neoprene construction.</p>