The metal D-625MW is part of our D-Series dynamo servo line. All Hitec D-Series servos have been designed using our brand new, cutting edge, custom engineering. Combining industry leading high-resolution, state-of-the-art ultra-response technology with a 32-bit MCU and 12-bit ADC for unprecedented programmability and flexibility, these servos deliver significantly smoother movement. The speedy, powerful line operates on a wide 4.8 ~ 8.4 voltage range, allowing use with any common battery chemistry without the need for adapters or regulators. Featuring Hitec's industry standard 25-tooth output spline with 3mm hex screw, each D-Series servo brings monster performance never known before in the market.- Motor Type:Coreless- Bearing Type:Dual Ball Bearing- Speed (4.8V / 6.0V / 7.4V):0.20 / 0.15 / 0.13 sec/60- Torque oz-in (4.8V / 6.0V / 7.4V):87 / 122 / 139 oz-in- Torque kg-cm (4.8V / 6.0V / 7.4V):6.3 / 8.8 / 10.0 kg-cm- Size in Inches:1.59 x 0.77 x 1.48 in