The Align 500 Ball Link is a component used in radio-controlled helicopters. It is a ball and socket joint that connects the control rod to the control surface of the helicopter, allowing the control surface to move in response to the pilot's inputs. The Align 500 Ball Link is designed for use with 500-sized helicopters, and its size and strength make it well-suited for high-performance flying. The ball and socket joint provides a smooth and precise connection, allowing for precise control of the helicopter's movements. The Align 500 Ball Link is made from durable materials and is designed to withstand the demands of high-performance RC helicopters.