Rc Helicopter Anti-crash Training Landing Kit for Esky Suitable for 400-450 helis including the T-Rex 450 V1 / V2 / SPORT / PRO, Blade 400, Beam E4, Falcon, Black Hawk, Belt CP, etc Bar Length: 40cm (15.7") Ball Diameter: 4cm (1.57") 100% Brand New 1 Set RC Training Kit for 400/450 Heli