The HS-81 and HS-81MG are among Hitec’s most popular servos. Available in both resin and metal gear versions. With a fine balance between speed and torque, the HS-81’s were designed to be both economical and reliable. HS81 MicroDimensions & Weight :4.8v 2.6Kg.cm 0.11 sec/60°6.0v 3.0Kg.cm 0.09 sec/60°29.8 x 12 x 29.6 16.6g