Feature: 1. Good Durability: The servo is made of excellent plastic and metal, and treated with precise craftsmanship, ensures durability. 2. Stable and Reliable: With high precise metal gears, hard anodized aluminum CNC mid shell, waterproof rubber sealing screws, stable and reliable. 3. Excellent Performance: The servo has fast heat dissipation, high torsion, good compatibility, and highly sensitive torsion compatibility. 4. 5 Servo Arm: There are 5 different servo arms in the set for you to use, which can meet your different needs. 5. Wide Usage: This high torsion waterproof digital servo is suitable for 1/10 1/8 RC car truck boat airplane robot. Specification: Item Type: Motor Servo Material: Metal, plastic Model: DS3218MG Colour: Black Working Voltage: 4.8-6.8V DC Torsion (5V): 19kg/cm Torsion (6.8V): 21.5kg/cm Speed: 0.16s/60° (5V), 0.14s/60°(6.8V) Reduction Ratio: 310:1 Rudder Specification: 25T/ψ5.80 Gear Ratio: 275 Pulse Width Range: 500-2500 μsec Working Frequency: 50-330Hz Neutral Position: 1500μs Controllable Angle: 270° Angle: 90° Dead Time: 3μs Drive Mode: PWM Motor Type: DC Motor Gear Type: Plastic, Aluminum Alloy, Electronic Components Size: Approx.41x40x20mm/1.6x1.57x0.8in Wiring: Red: Positive Black and Brown: Negative Yellow and White: Signal wire Compatible: Suitable for 1/10 1/8 RC Car Truck Boat Airplane Robot. Package List: 1 x Motor Servo5 x Servo Arm6 x Screw4 x Sealing Ring4 x Accessories Note: 1. Please allow 1‑3mm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.