The SG90 9G micro-servo has a torque of 1.5 kg/cm, lightweoght, stable performance compatible for remote control helicopter. Made of high quality metal and plastic, easy to install, performs well compatible with Liion batteries batteries, and the time can be changed to suit different brushless motors. Multi-function protecyion, which is include that comprehensive , low pressure cutoff , overheat , throttle signal loss . 30A ESC has safety arming function, throttle calibration function, and supports multiple program methods, the operate is easy and convenient. With a smooth surface, abrasion resistance and drop resistance, strong and durable, small and exquisite shape, is a combination of kits, and is complete, which can meet your various needs. Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use. size: 0.99 x 0.99 x 0.99 cm Material: plastic+metal colour: As Shown Package Contents: 1 x Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.