Description This is the Savox SC0252MG Metal Gear Digital Servo. Features:     Precision metal gears forms a strong and solid framework     Strict production and quality control of plastic components ensures long life and durability     Our servos are totally green – from materials to production, these servos are environmentally friendly.     Ideal for 30 size airplane or steering on 1/8th scale buggies.   Specifications: Dimensions(mm): 40.7X19.6X39.4 Weight(g): 49.0 Speed(@4.8V sec/60): .23 Torque(@4.8V oz-in): 100.0 Speed(@6.0V sec/60): .19 Torque(@6.0V oz-in): 145.8 Gear: Metal Bearing: 2BB Case: Plastic 25 Tooth Spline Frequency: 200-250hz Pulse Width Frequency: 1520 Compare With – Futaba: S3305; Hi-Tec: HRC35645S; Spektrum: A6020, S6020