** It is not suitable to use on R/C Helicopters for Hard 3D Flying. However, normal 3D is OK.
** It is a great servo for Air Plane / 250 & 450 Helicopter / Boat / Car when you do not need super fast response rate and high torque.
** The factory has two cases for this servo, one is Grey Transparency, another one is Black. Sometime this Analog servo will be shipped with Black case. We will just pick up the stock randomly, thank you for your kind attention.