Du-Bro Semi-Scale Tail Wheel System (40-90 Size Aircraft) Part No: 956. These complete ready-to-install Semi-Scale Tailwheel Systems are durable and great looking. Comes with rudder bracket and springs for control between rudder and tailwheel steering. Tailwheel included. Length = 4.875" / Height = 2.75" / Wheel Dia. = 1.1875" / Weight = 20.5 grams