These are simply the best servos you can buy at any price, and a great value too.Perfect centering, top ball bearings, tough Carbon Poly or all-Metal gear trains, Digital torque and precision, and full programmability all put the "control" back in your Radio Control!Fully programmable for Speed, Deflection, Centering, REVERSE, and more.CLICK HERE to See Datasheet for Full Specifications and Programming Guide.