HRC31055SHS-55 Sub Micro Servo, .14sec/18oz @ 6.0v The HS-55 set the standard for affordable performance, offering precision components that have been engineered to provide long lasting trouble free service! Featured in a hundred model aircraft reviews worldwide, the HS-55 is your best choice when it comes to controlling "smaller" Electric's and Park Flyers. Motor Type: Coreless Bearing Type: None Speed (4.8V/6.0V): 0.17 / 0.14 sec @ 60 deg. Torque oz./in. (4.8V/6.0V): 15 / 18 Torque kg./cm. (4.8V/6.0V): 1.08 / 1.30 Size in Inches: 0.89 x 0.45 x 0.94 Size in Millimeters: 22.61 x 11.43 x 23.88 Weight ounces: 0.28 Weight grams: 7.94 Features: Affordable Performance Precision Components Strong, Long-Lasting Nylon Gears Market's Most Reliable Micro Servo Most Popular Servo