The Hitec HS-85BB Servo Motor "Mighty Micro" features a high power motor for greater speed and torque. Available in both resin (this one) and metal gear versions (Hitec HS-85MG Servo Motor ), the HS-85BB is the choice of modellers looking for a high performance servo without breaking the bank. The ball bearing supported output shaft and sturdy gear trains are great for all your robotic projects. The servo has a standard spline patern similar to the 322 and 422 servos.