Started in the early 1960s, Efdyn has grown to become a leading supplier of energy absorption products. Over the course of the last 45 years, we have moved from Chicago to our present location of Tulsa, Oklahoma. Efdyn ha......Started in the early 1960s, Efdyn has grown to become a leading supplier of energy absorption products. Over the course of the last 45 years, we have moved from Chicago to our present location of Tulsa, Oklahoma. Efdyn has a reputation for manufacturing quality products of outstanding value. Our eagerness to build upon this reputation drives us to constantly examine and improve our methods and processes to insure that we continue to provide our customers with superior products and service. From that beginning over 45 years ago, Efdyns products have been used on a variety of very diverse applications. Our products can be found at Disney Land and Universal Studios supporting the space shuttle launch protecting our troops both home and overseas, and many other areas. Cross-overs of many competitor models Adjustable, custom orificed, or self compensating shock absorbers Highest capacity and most durable rotary dampers available Tecspak elastomer bumpers Fastest shock deliveries in the industry