Savox hv digital brushless tail servo 7kg/0. 035s@7. 4v these servos feature a redesigned motor/controller unit. This servo comes equipped with dual ball bearings and an all metal gear train, yet weighs in at only 66 grams. Suitable for electric/nitro cars and electric helicopters. Spec check: dimensions: 40. 3 x 20. 2 x 38. 7mm weight: 66g speed (sec/60â°): @6. 4v 0. 045, @7. 4v 0. 032 torque (kg-cm/oz-in): @6. 0v 5. 0/69. 4, @7. 4v 7. 0,97. 2 gear: metal case: aluminium bearing: 2bb (sav-sb2272mg)