1.9-Gram Linear Long Throw BB ServoKey Features Compact footprint JST SHR connector type Two ball bearings 9. 1mm servo throw Overview The AS2000LBB is a ball bearing version of the AS2000L servo. Its a high performance micro weight servo used in ultra micro heli and plane applications and is compatible with the AR6400 series of Spektrum receivers. Ultra micro aircraft builders will want the 2000LBB for the better control surface centering and robust action aggressive 3D flight