Sullivan Products was founded over 50 years ago and have been made in Baltimore, Maryland for the last 40 years. It began as a small manufacturer of control line products for the consumer model aircraft market. These high quality products were a success, and over the ensuing years Sullivan created products for the growing radio control segment. In later years Sullivan merged with other companies to serve a broader range of markets with a line of laboratory glassware, science equipment and model railroad accessories. This gave Sullivan access to even more engineering and equipment resources. The Sullivan heavy duty line connectors are perfect for connecting your model and your control line handle to the flying lines, easy attachment and made of spring steel. These connectors have been tested safely up to a pull of 40 or 80 lbs.