Dubro DB3353 Heavy Duty XL Control Horn (2)This "jumbo" size control horn has been designed for giant scale aircraft and it boasts two adjustment positions for a superior set up. Made from high strength nylon, you will have the confidence you need when you hit the flight line. , your install will be rigid! The included 4 40 swivel ball link provides an easier fit and the strong connection you demand. 2 pkg.