Tower Pro Rc Mini Micro 9g 1.6KG Servo Motor SG90 for RC 250 450 Helicopter Airplane Car Boat Technical data: Size: 21.5mmX11.8mmX22.7mm Weight: 9 grams No-load speed: 0.12 seconds / 60 degrees (4.8V) Stall torque of 1.2 – 1.4 kg / cm (4.8V)