Savox SAVSA1258TG High Speed Coreless Motor Titanium & Aluminum Gear, Standard Torque(@6v): 166.6 oz-in Speedboat): 0.08 sec/60Deg Dimension l x w x h(mm): 40.3x20. 2x37. 2; weighted): 52.4 Minimized backlash for ultra smooth and precise control surface operation! Coreless motor driven, Nominal operating voltage 4.8-6.0V Drivetrain: titanium Alloy and aluminum; Spline: 25T; bearing: 2BB; case: anodized aluminum body Ideal for Standard size servo airplane applications