This is the "speed" version of the Dymond 4.7 gram servo. These servos are the choice of top pilots for F3P competition planes. They center better than any micro servo and they are very powerful for their size. Dimensions .85" x .69" x .31". Voltage Range 3.6 to 9.6v, Torque 9oz/in, Speed .09 sec/60deg., Weight 4.7 grams (.165 oz) NOTE: Strong enough for elevator and rudder control only!