9g digital servo specs: (can be perfectly used for 450/400 Class Helicopters) *Size: 23.0 x 12.0x 21.5mm *Operating Speed: 0.12sec/60degree *Stall Torque: 1.5 kg/cm *Operating Voltage: 4.80-6 Volts Maytech 9gram servo is a superior performance servo, coming from the same factory as HD Power servos. It may be sold at a budget price but the performance and quality will easily match or exceed any other servo on the market! Excellent quality servos, equivalent to SG90. Anyone that has used these is amazed by quality! ! Light and very quick servo ideal for weight sensitive applications. Includes several servo horns, grommets and mounting screws. 9g digital servo specs: (can be perfectly used for 450/400 Class Helicopters) *Size: 23.0 x 12.0x 21.5mm *Operating Speed: 0.12sec/60degree *Stall Torque: 1.5 kg/cm *Operating Voltage: 4.80-6 Volts Maytech 9gram servo is a superior performance servo, coming from the same factory as HD Power servos. It may be sold at a budget price but the performance and quality will easily match or exceed any other servo on the market! Excellent quality servos, equivalent to SG90. Anyone that has used these is amazed by quality! ! Light and very quick servo ideal for weight sensitive applications. Includes several servo horns, grommets and mounting screws. Type: MTAS007 Size: 22.5X11.5X24.6mm (0.88"x0.45"x0.96") Weight: 13.6g Operating voltage: 4.8V~6.0V Operating current: 200mA/60¿¼ Operateing speed: 0.12sec/60¿¼ Stall torque: 1.8kg.cm Dead band: í-3uSec Ball bearing: MR85 Gear Mterial: Metal Connector wire length: 215mm Weight: 43g